update building from source in readme to include buildFlags.

Author: barthr

README.tmpl.md

@@ -80,7 +80,9 @@ update if needed.
 ## Local Installation
 It's a not recommended for your CI pipeline. Only install like this for your local development environment.
 ```bash
-go get -u github.com/golangci/golangci-lint/cmd/golangci-lint
+go get -u github.com/golangci/golangci-lint
+cd $GOPATH/src/github.com/golangci/golangci-lint/cmd/golangci-lint
+go install -ldflags "-X 'main.version=$(git rev-parse --abbrev-ref HEAD)' -X 'main.commit=$(git rev-parse --short HEAD)' -X 'main.date=$(date)'"
 ```
 
 You can also install it on OSX using brew: