Set travis pypitest publish on stage branche

Signed-off-by: Christian Tremblay <christian.tremblay@servisys.com>

.travis.yml

@@ -22,7 +22,7 @@ deploy:
     secure: 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
   distributions: sdist bdist_wheel
   on:
-    branch: master
+    branch: stage
 
 - provider: pypi
   server: https://pypi.python.org/pypi