Shorten doc line

Signed-off-by: Philippe Ombredanne <[email protected]>

Author: pombredanne

CHANGELOG.rst

@@ -100,7 +100,8 @@ v0.9.5
 v0.9.4
 ------
 
-- Create PyPI cache location in the home directory if a cache directory cannot be made at the project root.
+- Create PyPI cache location in the home directory if a cache directory cannot be made at the
+  project root.
 - Replace packaging with packvers.
 - Prevent duplicated package versions.