Implement temporary workaround for linter issue

This is necessary because of golangci/golangci-lint#659.

Author: Tobi Fuhrimann

Dockerfile

@@ -1,4 +1,4 @@
 FROM golang:1
 
-RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $GOPATH/bin \
-  && go get -u github.com/frapposelli/wwhrd
+RUN go get github.com/golangci/golangci-lint/cmd/golangci-lint \
+  && go get github.com/frapposelli/wwhrd