ci: remove travis config

.travis.yml

@@ -1,16 +0,0 @@
-os: windows
-language: node_js
-node_js:
-  - "node"
-cache:
-  yarn: true
-  directories:
-    - node_modules
-install:
-  - yarn install
-  - yarn lerna link
-  - yarn build
-script:
-  - node --version
-  - yarn --version
-  - yarn test