fix link to license

README.md

@@ -22,6 +22,6 @@ if you want to join the Github organization just let us know and we’ll add you
 Fork this repository and contribute back using pull requests to the master branch! More info coming.
 Easy starting points are also reviewing [pull requests](https://github.com/nextcloud/ios/pulls) and working on [starter issue](https://github.com/nextcloud/ios/issues?q=is%3Aopen+is%3Aissue+label%3A%22starter+issue%22) - we're working on adding those, of course!
 
-**License:** [GPLv3](https://github.com/nextcloud/ios/blob/master/LICENSE.txt) with [Apple app store exception](https://github.com/nextcloud/ios/blob/master/COPYING.iOS).
+**License:** [GPLv3](https://github.com/nextcloud/ios/blob/master/LICENSE) with [Apple app store exception](https://github.com/nextcloud/ios/blob/master/COPYING.iOS).