[acronym] Update manifest.ini

acronyms_expander/manifest.ini

 [info]
 name: Acronyms Expander
 short_name: acronyms_expander
-version: 0.2
+version: 0.3
 description: Replaces acronyms (or other strings) with given expansions/substitutes.
 authors: Mateusz Biliński <mateusz@bilinski.it>
-homepage: http://blog.bilinski.it
+homepage: https://dev.gajim.org/gajim/gajim-plugins/wikis/AcronymsExpanderPlugin