Explain which actions on Location are exposed & update method name

CHANGELOG

@@ -1,7 +1,7 @@
 == Version 3.1.8
 
-* Expose `Location`
-* Added create_permission_url and create_auth_url methods
+* Expose `index` and `show` actions of `Location` 
+* Added create_permission_url and request_token helper methods
 * Edited the readme to better describe the getting started procedure
 
 == Version 3.1.7