Drop go 1.3 and 1.4 support (bufio.Reader.Discard)

Author: riking

.travis.yml

@@ -3,10 +3,6 @@ sudo: false
 
 matrix:
   include:
-    - go: "1.3"
-      env: SKIP_TOKENIZER=true
-    - go: "1.4"
-      env: SKIP_TOKENIZER=true
     - go: "1.5"
     - go: "1.6"
     - go: "1.7"
@@ -21,9 +17,4 @@ script:
   - go get -t -v ./...
   - diff -u <(echo -n) <(gofmt -d .)
   - go vet $(go list ./... | grep -v /vendor/)
-  - >
-      if [ "$SKIP_TOKENIZER" = "true" ]; then
-        go test -v -race ./scanner
-      else
-        go test -v -race ./...
-      fi
+  - go test -v -race ./...