Move golangci-lint configuration to file (#635)

.travis.yml

@@ -12,6 +12,7 @@ git:
 env:
   global:
     - GOOS=linux GOARCH=amd64
+    - GOLANGCI_VERSION="v1.12.3"
 
 matrix:
   # It's ok if our code fails on unstable development versions of Go.
@@ -26,9 +27,9 @@ notifications:
 
 before_script:
   # Get version info from tags.
-  - MY_VERSION=$(git describe --tags)
+  - MY_VERSION="$(git describe --tags)"
   # Retrieve the golangci-lint linter binary.
-  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b $GOPATH/bin v1.12.2
+  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b ${GOPATH}/bin ${GOLANGCI_VERSION}
   # Retrieve and prepare CodeClimate's test coverage reporter.
   - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
   - chmod +x ./cc-test-reporter
@@ -36,7 +37,7 @@ before_script:
 
 script:
   # Run the linter.
-  - golangci-lint run --enable-all -D lll -D errcheck -D gosec -D maligned -D prealloc -D gocyclo -D gochecknoglobals
+  - golangci-lint run
   # Run all the tests with the race detector and generate coverage.
   - go test -v -race -coverprofile c.out ./...
   # Run the build script to generate the necessary binaries and images.