upgrade golangci-lint

golangci/golangci-lint#663

Author: temoto

.travis.yml

@@ -18,7 +18,7 @@ matrix:
   - go: 1.x
     env: task=clean GO111MODULE=on
     install:
-      - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b $GOPATH/bin v1.16.0
+      - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b $GOPATH/bin v1.19.1
 
 install: true
 script: ./script/${task:-test}