Update README.md

http://reader.tomtasche.at/ redirects to
https://opendocument.app/, as such I thought that this change would be welcome.

Author: 8pen-s8urce

README.md

@@ -10,8 +10,8 @@ Feel free to use it in your own project too, but please don't forget to tell us
      alt="Get it on Google Play"
      height="80">](https://play.google.com/store/apps/details?id=at.tomtasche.reader)
 
-More information at http://reader.tomtasche.at/ and in the app itself.
+More information at https://opendocument.app/ and in the app itself.
 
 ## Setup
 
-- `conan remote add odr https://artifactory.opendocument.app/artifactory/api/conan/conan`
+- `conan remote add odr https://artifactory.opendocument.app/artifactory/api/conan/conan`