Run lint/flow/doc/examples in CI

web3.js/.travis.yml

@@ -3,9 +3,13 @@ node_js:
   - "lts/*"
   - "node"
 
-before_script: npm run lint
-script: npm run test
-after_success: npm run coveralls
+script:
+  - npm run doc
+  - npm run flow
+  - npm run lint
+  - for example in examples/*.js; do node $example; done
+after_success:
+  - npm run coveralls
 
 before_deploy:
   - rm -rf deploy