Update CONTRIBUTE.rst
Change project status beta which is consistent with setup.cfg.
@@ -10,8 +10,8 @@ Resources
- Project owner: Hiroshi Miura
- Bug Tracker: Github issue `Tracker`_
-- Status: alpha
-- Activity: high
+- Status: Beta
+- Activity: moderate
.. _`Tracker`: https://github.com/miurahr/aqtinstall/issues
