Remove Travis CI (#5665)

.travis.yml

@@ -1,20 +0,0 @@
-language: node_js
-
-node_js:
-  - "8"
-
-script:
-  - grunt
-
-notifications:
-  email: false
-
-deploy:
-  - provider: npm
-    email:
-      secure: T/xRKPHPI1GwomNYb3nvMntS805vdzewDKNwB+lDS6WOfXQx9td5CIbkhpfAW3zVjdbsXFVSOzufesY+RtF4gq8yvW5FhV7py6gwnEyW8LybgYssUd08W/fMoiCjORRXxwqnoHEh956z3Z9De4Q9ow47m8iniAsKRR1I1DHaKs0=
-    api_key:
-      secure: BCdGeRjm8i9V+gbaVNIYk7+zLyeLOQDm6eCH+NYVX137gkNBoYqL/U7GGfHoWxEvrVgN8tcCM6RrS5qU+Wu/Wy/esz1PeSoFxKEIJx+p6BCzACFl1tJWqdm/JlmnuCiZdHs6TTtfKQwaJAK4H0Kfp5qJZS9QA/RxBpkfBQZW9VY=
-    on:
-      tags: true
-    skip_cleanup: true