docs: update docs

.travis.yml

@@ -1,21 +1,5 @@
 language: node_js
-sudo: false
-
-node_js:
-  - 8
-
-cache:
-  directories:
-  - node_modules
-
-before_install:
-  - export CHROME_BIN=chromium-browser
-  - export DISPLAY=:99.0
-
-install:
-  - npm install -g yarn
-  - yarn
-
-script:
-  - npm run build
-
+node_js: 10
+script: npm run test
+notifications:
+  email: false