Update README.md

Author: mikemix

README.md

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 # Tactician ZF3 Module
 
-## Did I help? If so please consider donating
-
-[![](http://img.shields.io/gratipay/user/mikemix.svg)](https://gratipay.com/TacticianModule-for-Zend-Framework/)
-
 Donations will encourage me to work harder on this free project.
 
 ### Wrapper module for easy use of the [Tactician](http://tactician.thephpleague.com/) Command Bus in your ZF3 applications.