Preparing src for release 6.2.0

Author: fiboknacky

ChangeLog.md

@@ -1,3 +1,10 @@
+### 6.2.0
+
+AdWords:
+  - Fixed [issue #81](https://github.com/googleads/googleads-php-lib/issues/81).
+  - Removed support and examples for v201409.
+    See the [deprecation schedule](https://developers.google.com/adwords/api/docs/sunset-dates) for more information.
+
 ### 6.1.0
 
 AdWords:

README.md

@@ -146,6 +146,17 @@ $operations[] = $operation;
 $campaignReturnValue = $campaignService->mutate($operations);
 ```
 
+### How do I set different client customer IDs than specified in auth.ini?
+
+You can do this by calling `SetClientCustomerId()` of an `AdWordUser` object
+with a parameter as client customer ID you want to set to:
+
+```php
+// Create an AdWordsUser instance using the default constructor, which will load
+// information from the auth.ini file as described above.
+$user = new AdWordsUser();
+$user->SetClientCustomerId('INSERT_CLIENT_CUSTOMER_ID_HERE');
+```
 
 ### How do I enable logging?