Update golangci-lint from v1.27.0 to v1.30.0

Author: dhui

.travis.yml

@@ -34,7 +34,7 @@ before_install:
   - sudo apt-get update
   - sudo apt-get -y -o Dpkg::Options::="--force-confnew" install docker-ce
   # Install golangci-lint
-  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.27.0
+  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.30.0
   - echo "TRAVIS_GO_VERSION=${TRAVIS_GO_VERSION}"
 
 install: