Fix broken docs (blue-yonder#328)

* use datetime.datetime.today to get current date

* fix sphinx version 1.6.4

Author: MaxBenChrist

docs/conf.py

@@ -39,7 +39,7 @@
 # -- General configuration -----------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
-needs_sphinx = '1.4.3'
+needs_sphinx = '1.6.4'
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
@@ -62,7 +62,7 @@
 
 # General information about the project.
 import datetime
-now = datetime.datetime()
+now = datetime.datetime.today()
 project = u'tsfresh'
 copyright = u'2016-{}, Maximilian Christ et al./ Blue Yonder GmbH'.format(now.year)