Bump to 1.3.0a0

Author: asvetlov

aiohttp_jinja2/__init__.py

@@ -22,7 +22,7 @@
 from .helpers import GLOBAL_HELPERS
 from .typedefs import Filters
 
-__version__ = "1.2.0"
+__version__ = "1.3.0a0"
 
 __all__ = ("setup", "get_env", "render_template", "render_string", "template")