Removing RUNNING version.

ALthough super cool addition by @pinkywafer . I want this to run against the LATEST version of Home Assistant for two reasons. 
1) Catch potential issues coming down the pike.
2) reassure followers of the repo that my code works for the current version of HA, not just the one I might be running. 

But thanks so much for the addition @pinkywafer !

.travis.yml

@@ -5,10 +5,9 @@ python: "3.7"
 before_install:
   - touch fake_key.pem
   - mv config/travis_secrets.yaml config/secrets.yaml
-  - HA_VERSION=$(<config/.HA_VERSION)
 
 install:
-  - pip3 install homeassistant==${HA_VERSION}
+  - pip3 install homeassistant
   - pip3 install colorlog
   - pip3 install python-dateutil