Changed Git Clone Instruction to use https

Signed-off-by: Henry McGilton <[email protected]>

Author: Henry McGilton

readme.md

@@ -27,7 +27,7 @@ Building the App
 First, check out the source, including all the dependencies:
 
 ```
-git clone --recurse-submodules git@github.com:ResearchKit/mPower.git
+git clone --recurse-submodules  https://github.com/ResearchKit/mPower.git
 ```
 
 ###Building it