Restore godeps before generating release artifacts

Author: jwilder

Makefile

@@ -16,5 +16,6 @@ dist: dist-clean
 	mkdir -p dist/linux/i386  && GOOS=linux GOARCH=386 go build -o dist/linux/i386/docker-gen
 
 release: dist
+	godep restore
 	tar -cvzf docker-gen-linux-amd64-latest.tar.gz -C dist/linux/amd64 docker-gen
 	tar -cvzf docker-gen-linux-i386-latest.tar.gz -C dist/linux/i386 docker-gen