Bump version number to 0.12.4.dev

Author: davidism

flask/__init__.py

@@ -10,7 +10,7 @@
     :license: BSD, see LICENSE for more details.
 """
 
-__version__ = '0.12.3'
+__version__ = '0.12.4.dev'
 
 # utilities we import from Werkzeug and Jinja2 that are unused
 # in the module but are exported as public interface.