Go lint doesn't work with go 1.5 anymore

I have removed it from the .travis.yml file (so now we only test on 1.6 and 1.7) and I removed it from circle CI

Author: levigross

.travis.yml

@@ -6,7 +6,7 @@ go:
 #  - 1.2 This won't work with our XML wonderfulness
 #   - 1.3 This won't work with golint
 #   - 1.4 This won't work with golint
-  - 1.5
+#   - 1.5 This won't work with golint
   - 1.6
   - 1.7
   # - tip

circle.yml

@@ -1,11 +1,5 @@
-dependencies:
-  pre:
-      - go get github.com/axw/gocov/gocov
-      - go get github.com/mattn/goveralls
-      - go get github.com/golang/lint
 test:
   override:
       - diff -u <(echo -n) <(gofmt -s -d ./)
       - diff -u <(echo -n) <(go vet ./...)
-      - diff -u <(echo -n) <(golint ./...)
       - go test -v -race ./...