fix project compilation on recent GO versions

Makefile

@@ -9,7 +9,7 @@ buildNodeFrontend:
 	cd web && rm build/static/**/*.map
 
 embedFrontend:
-	cd cmd/golang-url-shortener && packr2 --legacy
+	cd cmd/golang-url-shortener && packr2
 
 getCMDDependencies:
 	go get -v github.com/mattn/goveralls
@@ -24,7 +24,7 @@ getGoDependencies:
 buildProject:
 	rm -rf releases
 	mkdir releases
-	gox -output="releases/{{.Dir}}_{{.OS}}_{{.Arch}}/{{.Dir}}" -osarch="linux/amd64 linux/arm windows/amd64 windows/386 darwin/amd64" -ldflags="-X github.com/mxschmitt/golang-url-shortener/internal/util.ldFlagNodeJS=`node --version` -X github.com/mxschmitt/golang-url-shortener/internal/util.ldFlagCommit=`git rev-parse HEAD` -X github.com/mxschmitt/golang-url-shortener/internal/util.ldFlagYarn=`yarn --version` -X github.com/mxschmitt/golang-url-shortener/internal/util.ldFlagCompilationTime=`TZ=UTC date +%Y-%m-%dT%H:%M:%S+0000`" ./cmd/golang-url-shortener
+	CGO_ENABLED=0 gox -output="releases/{{.Dir}}_{{.OS}}_{{.Arch}}/{{.Dir}}" -osarch="linux/amd64 linux/arm windows/amd64 windows/386 darwin/amd64" -ldflags="-X github.com/mxschmitt/golang-url-shortener/internal/util.ldFlagNodeJS=`node --version` -X github.com/mxschmitt/golang-url-shortener/internal/util.ldFlagCommit=`git rev-parse HEAD` -X github.com/mxschmitt/golang-url-shortener/internal/util.ldFlagYarn=`yarn --version` -X github.com/mxschmitt/golang-url-shortener/internal/util.ldFlagCompilationTime=`TZ=UTC date +%Y-%m-%dT%H:%M:%S+0000`" ./cmd/golang-url-shortener
 	find releases -maxdepth 1 -mindepth 1 -type d -exec cp config/example.yaml {}/config.yaml \;
 	find releases -maxdepth 1 -mindepth 1 -type d -exec tar -cvjf {}.tar.bz2 {} \;
 

README.md

@@ -48,3 +48,16 @@ Only because I just want to extend my current self hosted URL shorter (which was
 - Travis CI
 - Key / Value databases
 - Dockerfile and Docker Image Creation
+
+## Compilation from Source
+
+```sh
+test -n "$GOPATH" || echo "GOPATH is not set"
+export GO111MODULE=auto
+go get github.com/mxschmitt/golang-url-shortener
+cd $GOPATH/src/github.com/mxschmitt/golang-url-shortener
+git remote add mine git@github.com:nmasse-itix/golang-url-shortener.git
+git pull mine master
+make
+``` 
+