add missing provider to .travis.yml

Author: barryorourke

.travis.yml

@@ -17,6 +17,7 @@ script:
   - nosetests --with-coverage --cover-package=sensu_plugin --cover-min-percentage=25 sensu_plugin/test/
 
 deploy:
+  provider: pypi
   user: sensu_plugins
   password:
     secure: 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