Change released version to 1.4.1

Sadly, I uploaded the wrong file to PyPI for 1.4.0. Once you do this, PyPI
never lets you change the file associated with a given released version. So we
need to use 1.4.1 instead. 😢

Author: sampsyo

docs/changelog.rst

@@ -1,13 +1,7 @@
 Changelog
 =========
 
-1.4.1 (in development)
-----------------------
-
-Changelog goes here!
-
-
-1.4.0 (November 25, 2016)
+1.4.1 (November 25, 2016)
 -------------------------
 
 Version 1.4 has **alpha-level** Python 3 support. Thanks to the heroic efforts