Change version schema from 0.12.1dev to 0.12.1a for sake of following pep 440

asvetlov · asvetlov · commit a1e331935c91 · 2014-12-28T12:50:08.000+02:00
diff --git a/aiohttp/__init__.py b/aiohttp/__init__.py
@@ -1,6 +1,6 @@
 # This relies on each of the submodules having an __all__ variable.
 
-__version__ = '0.12.1dev'
+__version__ = '0.12.1a'
 
 
 from .protocol import *  # noqa
