Update index.md

index.md

@@ -66,9 +66,6 @@ This website uses Google Analytics. See their Privacy Policy [here](https://supp
     * [RTAB-Map's page at IntRoLab](http://introlab.3it.usherbrooke.ca/index.php/RTAB-Map)
     * [Papers](https://introlab.3it.usherbrooke.ca/index.php/RTAB-Map#Publications)
     * Similar projects: [Find-Object](http://introlab.github.io/find-object/)
-    * If you find this project useful and to help me keeping this project updated, you can buy me a cup of coffee with the link below :P. It is also nice to receive new sensors to test with and even supporting them in RTAB-Map for quick SLAM demonstrations (e.g., stereo cameras, RGB-D cameras, 2D/3D LiDARs). Thanks [Stereolabs](https://www.stereolabs.com/) for the [ZED](https://www.stereolabs.com/zed/specs/), thanks Walt (with Tango coupon discount) and Google for [Google Tango Development Kits](https://store.google.com/product/tango_tablet_development_kit), thanks [Luxonis](https://www.luxonis.com/) for OAK-D camera and thanks to all contributors (for donations, reporting bugs, helping me fixing bugs or making pull requests).
-
-    [![paypal](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=X8TCXXHHDL62Q)
 
 ## What's new 
 
@@ -239,3 +236,4 @@ New release [v0.20.2](https://github.com/introlab/rtabmap/releases/tag/0.20.2)!
    <a href="http://www.youtube.com/watch?v=1dImRinTJSE"><img src="https://raw.githubusercontent.com/wiki/introlab/rtabmap/doc/video_screenshots/newcollegeomni.jpeg" alt="video" title="video"></a>
 
 * More loop closure detection videos [here](http://introlab.3it.usherbrooke.ca/index.php/RTAB-Map).
+