Delete old travis config

travis.yml

@@ -1,16 +0,0 @@
-language: node_js
-node_js:
-  - '8'
-  - '9'
-  - '10'
-install:
-  - npm install -g codecov
-script:
-  - yarn install
-  - yarn lint:all
-  - yarn test:coverage --runInBand --no-cache
-  - yarn test --runInBand --no-cache
-  - codecov
-cache:
-  directories:
-    - node_modules