Update sensor.travisci.markdown (home-assistant#3719)

Niklas V · fabaff · commit ab83a9eb090a · 2017-10-22T21:08:45.000+02:00
Changed the code example from github_token to api_key that is what is required. It is mostly confusing to have GitHub_token instead of api_key in the example code.
diff --git a/source/_components/sensor.travisci.markdown b/source/_components/sensor.travisci.markdown
@@ -21,7 +21,7 @@ To enable this platform, please add the following to your `configuration.yaml` f
 # Example configuration.yaml entry
 sensor:
   - platform: travisci
-    github_token: 123456789
+    api_key: 123456789
 ```
 
 Configuration variables:
