Update README to clarify the required submodule command.

README.md

@@ -6,12 +6,16 @@ a local binary (go_binary) and a local library (go_library).
 This requires bazel release > `bazel-0.20`.
 
 ```
+$ git clone https://github.com/laramiel/bazel-example-golang.git
+$ cd bazel-example-golang
+
 $ bazel run :hello
 
 $ bazel run :local
 $ bazel run :remote
 $ bazel run :bare
 
+$ git submodule update --init --recursive
 $ bazel run //submodule:bare
 $ bazel run //submodule:remote
 ```