Bump version (2.3.0)

Author: Mstrodl

setup.cfg

@@ -6,7 +6,7 @@ summary = Python Photo Gallery Written in Flask
 url = "https://github.com/ComputerScienceHouse/gallery"
 description-file = README.md
 license = MIT
-version = 2.2.0
+version = 2.3.0
 classifier =
     Natural Language :: English
     Operating System :: POSIX :: Linux