Use preferred way to install golangci-lint

Author: Tobi Fuhrimann

Dockerfile

@@ -1,5 +1,5 @@
 FROM golang:latest
 
 RUN curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
-RUN go get -u github.com/golangci/golangci-lint/cmd/golangci-lint
+RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $GOPATH/bin
 RUN go get -u github.com/frapposelli/wwhrd