Remove Travis-CI (#4972)

.travis.yml

@@ -1,18 +0,0 @@
-sudo: false
-language: node_js
-cache:
-  yarn: true
-  directories:
-    - bower_components
-install: yarn install
-script:
-  - npm run build
-  - hassio/script/build_hassio
-  # Because else eslint fails because hassio has cleaned that build
-  - ./node_modules/.bin/gulp gen-icons-app
-  - npm run test
-  # - xvfb-run wct --module-resolution=node --npm
-  # - 'if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then wct --module-resolution=node --npm --plugin sauce; fi'
-dist: trusty
-addons:
-  sauce_connect: true