fix golangci for go1.13

As suggested in golangci/golangci-lint#658

Author: Hugo Arregui

.travis.yml

@@ -7,7 +7,7 @@ env:
   - GO111MODULE=on
 
 before_script:
-  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b $GOPATH/bin v1.17.1
+  - GO111MODULE=off go get -u github.com/golangci/golangci-lint/cmd/golangci-lint
 
 script:
   - golangci-lint run ./...