Fix deployment credentials

Author: Cito

Diff for: .travis.yml

@@ -19,9 +19,13 @@ after_success:
 
 deploy:
   provider: pypi
-  user: mvanlonden
+  distributions: sdist bdist_wheel
   on:
+    branch: master
     tags: true
+    python: 3.7
+  skip_existing: true
+  user: mvanlonden
   password:
-    secure: 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
-  distributions: "sdist bdist_wheel"
+    secure: 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
+