Update golangci-lint to v1.27.0 (#9)

Author: pellared

Dockerfile

@@ -1,4 +1,4 @@
 # go
 FROM golang:1.14.2
 # golangci-lint
-RUN curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.26.0
+RUN curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.27.0