[doc] update copyright year automatically.

doc/ja/source/conf.py

@@ -12,6 +12,7 @@
 # serve to show the default.
 
 import sys, os
+from datetime import datetime
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
@@ -41,7 +42,7 @@
 
 # General information about the project.
 project = u'groonga storage engine'
-copyright = u'2010, groonga project'
+copyright = u'2009-' + unicode(datetime.today().year) + u', groonga project'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the