Version bump up to 0.9.4

CHANGES

 Change log
 ==========
 
+Version 0.9.4 (2014-06-04)
+  - Respect the `LESS' environment variable
+  - Support python 3.4
+  - Fix curl options in document
+
 Version 0.9.3 (2013-09-28)
 
   - Moved screenshots to 'gh-pages' branch

cdiff.py

 """
 
 META_INFO = {
-    'version'     : '0.9.3',
+    'version'     : '0.9.4',
     'license'     : 'BSD-3',
     'author'      : 'Matthew Wang',
     'email'       : 'mattwyl(@)gmail(.)com',