Fix flattr link

Co-Authored-By: MarcelMo <[email protected]>

Author: thinkyhead

README.md

@@ -97,5 +97,5 @@ While we can't prevent the use of this code in products (3D printers, CNC, etc.)
 
 <!-- [![Coverity Scan Build Status](https://scan.coverity.com/projects/2224/badge.svg)](https://scan.coverity.com/projects/2224) -->
 - [![Travis Build Status](https://travis-ci.org/MarlinFirmware/Marlin.svg)](https://travis-ci.org/MarlinFirmware/Marlin)
-- [![Flattr Scott Lahteine](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=thinkhead&url=https://github.com/MarlinFirmware/Marlin&title=Marlin&language=&tags=github&category=software) - Flattr Scott Lahteine
+- [![Flattr Scott Lahteine](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=thinkyhead&url=https://github.com/MarlinFirmware/Marlin&title=Marlin&language=&tags=github&category=software) - Flattr Scott Lahteine
 - [![Flattr Erik van der Zalm](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=ErikZalm&url=https://github.com/MarlinFirmware/Marlin&title=Marlin&language=&tags=github&category=software) - Flattr Erik van der Zalm