update shelljs as per dependabot suggestion (#272)

Signed-off-by: Sally MacFarlane <sally.macfarlane@consensys.net>

Author: macfarla

yarn.lock

@@ -4777,7 +4777,7 @@ backoff@^2.5.0:
 
 balanced-match@^1.0.0:
   version "1.0.2"
-  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.2.tgz"
+  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.2.tgz#e83e3a7e3f300b34cb9d87f615fa0cbf357690ee"
   integrity sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==
 
 base-x@^3.0.2, base-x@^3.0.8:
@@ -5016,7 +5016,7 @@ borc@^2.1.2:
 
 brace-expansion@^1.1.7:
   version "1.1.11"
-  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz"
+  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
   integrity sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==
   dependencies:
     balanced-match "^1.0.0"
@@ -6084,7 +6084,7 @@ compression@^1.7.4:
 
 concat-map@0.0.1:
   version "0.0.1"
-  resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz"
+  resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
   integrity sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=
 
 concat-stream@1.5.1:
@@ -9079,7 +9079,7 @@ fs-write-stream-atomic@^1.0.8:
 
 fs.realpath@^1.0.0:
   version "1.0.0"
-  resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz"
+  resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
   integrity sha1-FQStJSMVjKpA20onh8sBQRmU6k8=
 
 fsevents@2.1.2:
@@ -9107,7 +9107,7 @@ fsevents@~2.3.2:
 
 function-bind@^1.1.1:
   version "1.1.1"
-  resolved "https://registry.yarnpkg.com/function-bind/-/function-bind-1.1.1.tgz"
+  resolved "https://registry.yarnpkg.com/function-bind/-/function-bind-1.1.1.tgz#a56899d3ea3c9bab874bb9773b7c5ede92f4895d"
   integrity sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==
 
 function.prototype.name@^1.1.2, function.prototype.name@^1.1.3:
@@ -9744,7 +9744,7 @@ has-values@^1.0.0:
 
 has@^1.0.0, has@^1.0.3:
   version "1.0.3"
-  resolved "https://registry.yarnpkg.com/has/-/has-1.0.3.tgz"
+  resolved "https://registry.yarnpkg.com/has/-/has-1.0.3.tgz#722d7cbfc1f6aa8241f16dd814e011e1f41e8796"
   integrity sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==
   dependencies:
     function-bind "^1.1.1"
@@ -10232,7 +10232,7 @@ infer-owner@^1.0.3, infer-owner@^1.0.4:
 
 inflight@^1.0.4:
   version "1.0.6"
-  resolved "https://registry.yarnpkg.com/inflight/-/inflight-1.0.6.tgz"
+  resolved "https://registry.yarnpkg.com/inflight/-/inflight-1.0.6.tgz#49bd6331d7d02d0c09bc910a1075ba8165b56df9"
   integrity sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=
   dependencies:
     once "^1.3.0"
@@ -10315,7 +10315,7 @@ internal-slot@^1.0.3:
 
 interpret@^1.0.0:
   version "1.4.0"
-  resolved "https://registry.yarnpkg.com/interpret/-/interpret-1.4.0.tgz"
+  resolved "https://registry.yarnpkg.com/interpret/-/interpret-1.4.0.tgz#665ab8bc4da27a774a40584e812e3e0fa45b1a1e"
   integrity sha512-agE4QfB2Lkp9uICn7BAqoscw4SZP9kTE2hxiFI3jBPmXJfdqiahTbUuKGsMoN2GtqL9AxhYioAcVvgsb1HvRbA==
 
 invariant@^2.2.2, invariant@^2.2.4:
@@ -10616,6 +10616,13 @@ is-core-module@^2.2.0:
   dependencies:
     has "^1.0.3"
 
+is-core-module@^2.8.1:
+  version "2.8.1"
+  resolved "https://registry.yarnpkg.com/is-core-module/-/is-core-module-2.8.1.tgz#f59fdfca701d5879d0a6b100a40aa1560ce27211"
+  integrity sha512-SdNCUs284hr40hFTFP6l0IfZ/RSrMXF3qgoRHd3/79unUTvrFO/JoXwkGm+5J/Oe3E/b5GsnG330uUNgRpu1PA==
+  dependencies:
+    has "^1.0.3"
+
 is-data-descriptor@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/is-data-descriptor/-/is-data-descriptor-0.1.4.tgz"
@@ -13139,7 +13146,7 @@ minimalistic-crypto-utils@^1.0.1:
 
 minimatch@*, "minimatch@2 || 3", minimatch@3.0.4, minimatch@^3.0.4:
   version "3.0.4"
-  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz"
+  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
   integrity sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==
   dependencies:
     brace-expansion "^1.1.7"
@@ -14109,7 +14116,7 @@ on-headers@~1.0.2:
 
 once@1.x, once@^1.3.0, once@^1.3.1, once@^1.4.0:
   version "1.4.0"
-  resolved "https://registry.npmjs.org/once/-/once-1.4.0.tgz"
+  resolved "https://registry.yarnpkg.com/once/-/once-1.4.0.tgz#583b1aa775961d4b113ac17d9c50baef9dd76bd1"
   integrity sha1-WDsap3WWHUsROsF9nFC6753Xa9E=
   dependencies:
     wrappy "1"
@@ -14593,7 +14600,7 @@ path-exists@^4.0.0:
 
 path-is-absolute@^1.0.0:
   version "1.0.1"
-  resolved "https://registry.yarnpkg.com/path-is-absolute/-/path-is-absolute-1.0.1.tgz"
+  resolved "https://registry.yarnpkg.com/path-is-absolute/-/path-is-absolute-1.0.1.tgz#174b9268735534ffbc7ace6bf53a5a9e1b5c5f5f"
   integrity sha1-F0uSaHNVNP+8es5r9TpanhtcX18=
 
 path-is-inside@^1.0.2:
@@ -14611,7 +14618,7 @@ path-key@^3.0.0, path-key@^3.1.0:
   resolved "https://registry.yarnpkg.com/path-key/-/path-key-3.1.1.tgz"
   integrity sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==
 
-path-parse@^1.0.6:
+path-parse@^1.0.6, path-parse@^1.0.7:
   version "1.0.7"
   resolved "https://registry.yarnpkg.com/path-parse/-/path-parse-1.0.7.tgz"
   integrity sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw==
@@ -16513,7 +16520,7 @@ receptacle@^1.3.2:
 
 rechoir@^0.6.2:
   version "0.6.2"
-  resolved "https://registry.yarnpkg.com/rechoir/-/rechoir-0.6.2.tgz"
+  resolved "https://registry.yarnpkg.com/rechoir/-/rechoir-0.6.2.tgz#85204b54dba82d5742e28c96756ef43af50e3384"
   integrity sha1-hSBLVNuoLVdC4oyWdW70OvUOM4Q=
   dependencies:
     resolve "^1.1.6"
@@ -16906,7 +16913,16 @@ resolve@1.15.0:
   dependencies:
     path-parse "^1.0.6"
 
-resolve@^1.1.6, resolve@^1.10.0, resolve@^1.12.0, resolve@^1.14.2, resolve@^1.15.1, resolve@^1.20.0, resolve@^1.3.2, resolve@^1.8.1:
+resolve@^1.1.6:
+  version "1.22.0"
+  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.22.0.tgz#5e0b8c67c15df57a89bdbabe603a002f21731198"
+  integrity sha512-Hhtrw0nLeSrFQ7phPp4OOcVjLPIeMnRlr5mcnVuMe7M/7eBn98A3hmFRLoFo3DLZkivSYwhRUJTyPyWAk56WLw==
+  dependencies:
+    is-core-module "^2.8.1"
+    path-parse "^1.0.7"
+    supports-preserve-symlinks-flag "^1.0.0"
+
+resolve@^1.10.0, resolve@^1.12.0, resolve@^1.14.2, resolve@^1.15.1, resolve@^1.20.0, resolve@^1.3.2, resolve@^1.8.1:
   version "1.20.0"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.20.0.tgz"
   integrity sha512-wENBPt4ySzg4ybFQW2TT1zMQucPK95HSh/nq2CFTZVOGut2+pQvSsgtda4d26YrYcr067wjbmzOG8byDPBX63A==
@@ -17481,9 +17497,9 @@ shell-quote@1.7.2:
   integrity sha512-mRz/m/JVscCrkMyPqHc/bczi3OQHkLTqXHEFu0zDhK/qfv3UcOA4SVmRCLmos4bhjr9ekVQubj/R7waKapmiQg==
 
 shelljs@^0.8.3:
-  version "0.8.4"
-  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.8.4.tgz"
-  integrity sha512-7gk3UZ9kOfPLIAbslLzyWeGiEqx9e3rxwZM0KE6EL8GlGwjym9Mrlx5/p33bWTu9YG6vcS4MBxYZDHYr5lr8BQ==
+  version "0.8.5"
+  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.8.5.tgz#de055408d8361bed66c669d2f000538ced8ee20c"
+  integrity sha512-TiwcRcrkhHvbrZbnRcFYMLl30Dfov3HKqzp5tO5b4pt6G/SezKcYhmDg15zXVBswHmctSAQKznqNW2LO5tTDow==
   dependencies:
     glob "^7.0.0"
     interpret "^1.0.0"
@@ -18277,6 +18293,11 @@ supports-color@^7.0.0, supports-color@^7.1.0:
   dependencies:
     has-flag "^4.0.0"
 
+supports-preserve-symlinks-flag@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz#6eda4bd344a3c94aea376d4cc31bc77311039e09"
+  integrity sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==
+
 svg-parser@^2.0.0:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/svg-parser/-/svg-parser-2.0.4.tgz"
@@ -20369,7 +20390,7 @@ wrap-ansi@^7.0.0:
 
 wrappy@1:
   version "1.0.2"
-  resolved "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz"
+  resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
   integrity sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=
 
 write-file-atomic@2.4.1: