Update MANIFEST.in

MANIFEST.in

@@ -2,6 +2,8 @@ include README.rst
 include LICENSE
 include AUTHORS
 include CHANGES
+include CHANGES.old
+include CONTRIBUTING.rst
 include EXAMPLES
 include TODO
 
@@ -12,11 +14,15 @@ include sphinx-autogen.py
 include sphinx-build.py
 include sphinx-quickstart.py
 include sphinx-apidoc.py
+include test-reqs.txt
+include tox.ini
+include sphinx/locale/.tx/config
 
 recursive-include sphinx/templates *
 recursive-include sphinx/texinputs *
 recursive-include sphinx/themes *
-recursive-include sphinx/locale *.js *.po *.mo
+recursive-include sphinx/pycode/pgen2 *.c *.pyx
+recursive-include sphinx/locale *.js *.pot *.po *.mo
 recursive-include sphinx/search/non-minified-js *.js
 recursive-include sphinx/ext/autosummary/templates *
 recursive-include tests *