Remove beta tag from version.

Author: greschd

tbmodels/__init__.py

@@ -2,7 +2,7 @@
 TBmodels is a tool for creating / loading and manipulating tight-binding models.
 """
 
-__version__ = '1.3.0b1'
+__version__ = '1.3.0'
 
 # import order is important due to circular imports
 from . import helpers