Adjusted the README.md changelog

Created by: furlanrapha

Shouldn't the version be updated to 0.7.0?

CHANGELOG.md

@@ -39,7 +39,7 @@
 You may optionally update the global command (it’s not required):
 
 ```
-npm install -g create-react-app@0.6.0
+npm install -g create-react-app@0.7.0
 ```
 
 Inside any created project that has not been ejected, run: