Update .travis.yml

Author: syndbg

.travis.yml

@@ -22,7 +22,7 @@ cache:
 notifications:
   email: false
 before_script:
-  - go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.16.0
+  - curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.16.0
 script:
   - go run mage.go -v lint
   - go run mage.go -v test