Enforce no golangci-lint warnings in CI

.golangci.yml

@@ -0,0 +1,14 @@
+run:
+  skip-files: ast/identifier_set.go
+linters:
+  enable:
+    - stylecheck
+    - gochecknoinits
+    - golint
+issues:
+  exclude-use-default: false
+  exclude:
+    - "should have a package comment, unless it's in another file for this package"
+linters-settings:
+  golint:
+    min-confidence: 0

.travis.yml

@@ -49,6 +49,7 @@ before_install:
   - go get github.com/axw/gocov/gocov
   - go get github.com/mattn/goveralls
   - go get github.com/fatih/color
+  - go get -u github.com/golangci/golangci-lint/cmd/golangci-lint
   - if ! go get github.com/golang/tools/cmd/cover; then go get golang.org/x/tools/cmd/cover; fi
   - go get github.com/sergi/go-diff/diffmatchpatch
 

travisBuild.sh

@@ -1,9 +1,11 @@
 #!/usr/bin/env bash
 
+set -e
+
 run_tests() {
+  golangci-lint run ./...
   $GOPATH/bin/goveralls -service=travis-ci
   SKIP_GO_TESTS=1 ./tests.sh
 }
 
 run_tests
-