Update Readme with minor spelling fix

Change 'What Google say:' to What Google says:'

README.md

@@ -439,7 +439,7 @@ $arr_books = (new \GDS\Store('Book', $obj_gateway_local))->fetchPage(20);
 
 ## More About Google Cloud Datastore ##
 
-What Google say:
+What Google says:
 
 > "Use a managed, NoSQL, schemaless database for storing non-relational data. Cloud Datastore automatically scales as you need it and supports transactions as well as robust, SQL-like queries."
 
@@ -469,4 +469,4 @@ Whilst I am using this library in production, it is my hope that other people fi
 
 # Other App Engine Software #
 
-If you've enjoyed this, you might be interested in my [Full Text Search Library for PHP on Google App Engine](https://github.com/tomwalder/php-appengine-search)
+If you've enjoyed this, you might be interested in my [Full Text Search Library for PHP on Google App Engine](https://github.com/tomwalder/php-appengine-search)