Bump elliptic from 6.5.1 to 6.5.4

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.1 to 6.5.4.
- [Release notes](https://github.com/indutny/elliptic/releases)
- [Commits](indutny/elliptic@v6.5.1...v6.5.4)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -15,7 +15,7 @@
     "cloudinary": "^1.16.0",
     "connect-flash": "^0.1.1",
     "ejs": "^2.7.1",
-    "elliptic": "^6.5.1",
+    "elliptic": "^6.5.4",
     "express": "^4.17.1",
     "firebase": "^7.2.3",
     "jade": "^1.11.0",