fix travis deploy part 7

Author: darius BERNARD

.travis.yml

@@ -30,10 +30,10 @@ after_success:
 
 jobs:
   include:
-  - stage: test
   - stage: deploy
     script: tox -e package
-    install: skip
+    install:
+    - pip install "virtualenv" "tox>=1.9"
     before_install: []
     before_script: []
     after_success: []