Increase the version number to `0.4.3`

shallow_appify/_version.py

@@ -5,5 +5,5 @@ from __future__ import division
 from __future__ import print_function
 from __future__ import unicode_literals
 
-__version_info__ = (0, 4, 2)
+__version_info__ = (0, 4, 3)
 __version__ = '.'.join(map(str, __version_info__))