Bump 1.22.0 dev

Signed-off-by: Joffrey F <[email protected]>

compose/__init__.py

@@ -1,4 +1,4 @@
 from __future__ import absolute_import
 from __future__ import unicode_literals
 
-__version__ = '1.21.0dev'
+__version__ = '1.22.0dev'