Revert "bump version to 0.4.0"

0.3.0 is not yet released

This reverts commit f377183.

Author: glehmann

click_completion/__init__.py

@@ -15,7 +15,7 @@
 
 from click import echo, MultiCommand, Option, Argument, ParamType
 
-__version__ = '0.4.0'
+__version__ = '0.3.0'
 
 _invalid_ident_char_re = re.compile(r'[^a-zA-Z0-9_]')