Bump the version to 0.4

1st1 · 1st1 · commit 0753873a6d19 · 2018-04-03T12:18:18.000-04:00
diff --git a/immutables/__init__.py b/immutables/__init__.py
@@ -8,4 +8,4 @@
 
 
 __all__ = 'Map',
-__version__ = '0.3'
+__version__ = '0.4'
