Improve CI configs. (#214)

.travis.yml

@@ -1,6 +1,14 @@
-sudo: false
 language: node_js
+
+git:
+  depth: 5
+
 node_js:
-  - '8'
-  - '10'
-after_success: npm run coveralls
+  - "8"
+  - "10"
+  - "12"
+
+cache: npm
+
+after_success:
+  - if [[ "$TRAVIS_NODE_VERSION" = "10" ]]; then npm run coveralls; fi

appveyor.yml

@@ -1,30 +1,27 @@
-clone_depth: 10
-
 version: "{build}"
 
-# What combinations to test
+shallow_clone: true
+
 environment:
+  PLATFORM: x64
   matrix:
-    - nodejs_version: "8"
-      platform: x86
-    - nodejs_version: "10"
-      platform: x86
+    - NODEJS_VERSION: "8"
+    - NODEJS_VERSION: "10"
+    - NODEJS_VERSION: "12"
 
 install:
-  - ps: Install-Product node $env:nodejs_version $env:platform
-  - npm install
-
-test_script:
-  # Output useful info for debugging
-  - node --version && npm --version
-  # We test multiple Windows shells because of prior stdout buffering issues
-  # filed against Grunt. https://github.com/joyent/node/issues/3584
-  - cmd: npm test
+  - ps: Install-Product node $env:NODEJS_VERSION $env:PLATFORM
+  - npm ci
 
 build: off
 
+test_script:
+  - node --version
+  - npm --version
+  - npm test
+
 matrix:
   fast_finish: true
 
 cache:
-  - node_modules -> package.json
+  - '%APPDATA%\npm-cache\ -> appveyor.yml,package.json,package-lock.json'