remove .travis.yml

.travis.yml

----
-language: node_js
-node_js:
-  - "12"
-
-dist: xenial
-
-addons:
-  chrome: stable
-
-cache:
-  directories:
-    - $HOME/.npm
-
-env:
-  global:
-    # See https://git.io/vdao3 for details.
-    - JOBS=1
-
-branches:
-  only:
-    - master
-
-script:
-  - npm test