updated travis yml with the webpack build command

Author: code-n-chill

.travis.yml

@@ -7,7 +7,9 @@ cache:
 install:
   - pip install pipenv
   - pipenv install
-script: lektor build
+script:
+  - lektor plugins add webpack-support
+  - lektor build -f webpack
 deploy:
   provider: script
   script: lektor deploy ghpages