fix submodule head detaching

README.md

@@ -23,7 +23,7 @@ Next, tell git to download `pro-framework`:
 
 ```sh
 git submodule init
-git submodule update
+./pro update
 ```
 
 #### Setup and run
@@ -31,7 +31,7 @@ git submodule update
 Pro uses [Docker](https://www.docker.com/) and [Docker Compose](https://docs.docker.com/compose/install) (version >= 1.9.0 recommended). Be sure you have it installed and working beforehand.
 
 ```sh
-./pro s
+./pro start
 ```
 
 Visit [http://localhost:3000](http://localhost:3000)
@@ -42,7 +42,7 @@ and
 
 ```
 git pull pro-template master
-git submodule update
+./pro update
 ```
 
 ### Example app ###

pro

@@ -1,2 +1,8 @@
 #!/bin/bash
-./framework/tools/containers/docker/start.sh $@
+if [ "$1" == 'update' -o "$1" == 'u' ]; then
+  git submodule update
+  git submodule foreach git checkout master
+  git submodule foreach git pull origin master
+else
+  ./framework/tools/containers/docker/start.sh $@
+fi