Fix issue tracker link (#1039)

Author: mortonfox

README.md

@@ -314,7 +314,7 @@ Please see the [contributing](CONTRIBUTING.md) page for more information. In par
 
 For support with the library the best place to ask is via the google-api-php-client tag on StackOverflow: http://stackoverflow.com/questions/tagged/google-api-php-client
 
-If there is a specific bug with the library, please [file a issue](/Google/google-api-php-client/issues) in the Github issues tracker, including an example of the failing code and any specific errors retrieved. Feature requests can also be filed, as long as they are core library requests, and not-API specific: for those, refer to the documentation for the individual APIs for the best place to file requests. Please try to provide a clear statement of the problem that the feature would address.
+If there is a specific bug with the library, please [file a issue](https://github.com/google/google-api-php-client/issues) in the Github issues tracker, including an example of the failing code and any specific errors retrieved. Feature requests can also be filed, as long as they are core library requests, and not-API specific: for those, refer to the documentation for the individual APIs for the best place to file requests. Please try to provide a clear statement of the problem that the feature would address.
 
 ### I want an example of X! ###