ci(travis): add build stages

.travis.yml

@@ -1,13 +1,25 @@
-sudo: false
 language: node_js
 
-node_js:
-  - '9'
-  - '8'
-  - '6'
+jobs:
+  fast_finish: true
+  include:
+    - stage: Lint
+      env: SCRIPT=lint
+      node_js: 'stable'
+    - &test
+      stage: Test
+      env: SCRIPT=test
+      node_js: 'stable'
+    - <<: *test
+      node_js: 'lts/*'
+    - <<: *test
+      node_js: 6
 
-script:
-  npm run ci
+script: npm run $SCRIPT
 
 after_success:
-  npm run cover
+  - npm i codecov
+  - $(npm bin)/codecov
+
+notifications:
+  email: false

appveyor.yml

@@ -1,24 +1,27 @@
+build: 'off'
 
 init:
   - git config --global core.autocrlf input
+
 environment:
   matrix:
-    - nodejs_version: '9'
+    - nodejs_version: '10'
       webpack_version: latest
     - nodejs_version: '8'
       webpack_version: latest
     - nodejs_version: '6'
       webpack_version: latest
-build: 'off'
+
 matrix:
   fast_finish: true
+
 install:
   - ps: Install-Product node $env:nodejs_version x64
   - npm i -g npm@latest
   - npm install
+
 before_test:
-  - cmd: npm install webpack@%webpack_version%
+  - cmd: npm i webpack@%webpack_version%
+
 test_script:
-  - node --version
-  - npm --version
-  - cmd: npm run ci
+  - cmd: npm t