Configure Travis

.travis.yml

@@ -1,9 +1,31 @@
 language: node_js
-sudo: false
 node_js:
-  - "0.10"
-  - "0.12"
-  - "4"
-  - "5"
+  # https://github.com/nodejs/LTS
+  - "4" # ends April 2018
+  - "6" # ends April 2019
+  - "8" # ends December 2019
+
+sudo: false
+
+cache:
+  directories:
+  - node_modules
+
 before_install:
-  - npm i -g npm
+  - npm install coveralls
+
+before_script:
+  # Make npm run work for the script phase:
+  - if [ "x$TRAVIS_NODE_VERSION" != "x8" ]; then npm config set ignore-scripts false; fi
+  # these build targets only need to run once per build, so let's conserve a few resources
+  # ESLint only supports Node >=4
+  - if [ "x$TRAVIS_NODE_VERSION" = "x8" ]; then npm run lint; fi
+
+script:
+  - npm test
+
+after_success:
+  - if [ "x$TRAVIS_NODE_VERSION" = "x8" ]; then npm run test-coverage && cat ./coverage/lcov.info | coveralls lib; fi
+
+git:
+  depth: 10