Remove the link of donation for Hirbod

Working on this plugin is not only Hirbod.

Author: wf9a5m75

README.md

@@ -8,16 +8,6 @@ Join our online chat at<br>
 [![Gitter](https://badges.gitter.im/cordova-plugin-googlemaps.svg)](https://gitter.im/nightstomp/cordova-plugin-googlemaps)
 
 
-###Donation
-Please consider to make a small donation. We spent many hours to make this a great plugin, we even pay other developers to contribute new functions. In order to keep up the motivation, we ask for your help, too. Thanks!
-
-**Currently donated**: 50 $
-
-[![img](https://www.paypalobjects.com/webstatic/en_US/btn/btn_donate_cc_147x47.png)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=LLCBVUA7TQ8SU)
-
-Before I release the clustering feature, I want to raise a funding of 1000$. I will donate some of the funded money to @limeuwe for donating the code and to my developer for the Android part. If you want to donate for funding, please add a note about that fact inside of the comments on paypal, or it will be considered as a normal donation.
-
-**Currently funded**: 70 $
 
 ###Quick install