Fixed changing case in rename in case-insensitive file systems

- fixes #160
diff --git a/docs/conf.py b/docs/conf.py
index f40e506..b6a14a4 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -55,7 +55,7 @@
 
 # General information about the project.
 project = 'pyfakefs'
-copyright = '2016, John McGehee'
+copyright = '2017, John McGehee'
 author = 'John McGehee'
 
 # The version info for the project you're documenting, acts as replacement for
@@ -63,9 +63,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '3.0'
+version = '3.1'
 # The full version, including alpha/beta/rc tags.
-release = '3.0'
+release = '3.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.