Allow any 0.5.x version of mautrix-python

requirements.txt

@@ -4,5 +4,5 @@ alembic>=1,<2
 ruamel.yaml>=0.15.94,<0.17
 commonmark>=0.8,<0.10
 python-magic>=0.4,<0.5
-mautrix==0.5.1
+mautrix>=0.5.2,<0.6
 fbchat-asyncio==0.6.0