Update flattr url

README.md

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 A base64 encoder/decoder application for [Sailfish OS](https://sailfishos.org).
 
-[![Flattr this git repo](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=ilpianista&url=https://gitlab.com/ilpianista/harbour-Base64&title=harbour-Base64&language=&tags=jolla&category=software)
+[![Flattr this git repo](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=ilpianista&url=https://git.merproject.org/ilpianista/harbour-Base64&title=harbour-Base64&language=&tags=jolla&category=software)
 
 Translations via [Transifex](https://www.transifex.com/ilpianista-harbour/harbour-Base64/dashboard/), thank you!