Merge pull request #31 from larrykluger/master

Updated composer info in the ReadMe

Author: Tom Walder

README.md

@@ -75,6 +75,9 @@ To install using composer, use this require line
 `"tomwalder/php-gds": "dev-master"`
 
 I use the Google php api client for low-level access to Datastore services, so that will get pulled in to your project too.
+Since the Google php api client development version is used, you also need to add 
+
+`"minimum-stability": "dev"` to your composer file.
 
 ### Running the examples ###