chore: remove travis, refactor test scripts

.travis.yml

@@ -1,22 +0,0 @@
-language: node_js
-cache:
-  yarn: true
-  directories:
-    - $HOME/.npm
-    - $HOME/.yarn-cache
-    - node_modules
-    - ~/.cache
-node_js:
-  - '8'
-  - '10'
-env:
-  - TEST_SUITE="test:unit"
-  - TEST_SUITE="test:e2e:ci"
-install:
-  - yarn bootstrap
-script:
-  - yarn test-ci
-notifications:
-  email: false
-git:
-  depth: 5