Update dependencies (#55)

* Update to latest Karma for testing
* Replace PhantomJS with jsdom for testing
* Downgrade Karma and jsdom when testing on Node <= 8

.github/workflows/ci.yml

@@ -17,4 +17,9 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm install
+      - name: Downgrade Karma and jsdom for Node <= 8
+        if: matrix.node-version == '6' || matrix.node-version == '8'
+        run: |
+          npm uninstall karma karma-jasmine jsdom
+          npm install --save-dev karma@3 karma-jasmine@2 jsdom@11
       - run: npm test

karma.conf.js

@@ -28,7 +28,7 @@ module.exports = function(config) {
 
     plugins: [
       'karma-jasmine',
-      'karma-phantomjs-launcher',
+      'karma-jsdom-launcher',
       require('./lib')
     ],
 
@@ -85,7 +85,7 @@ module.exports = function(config) {
 
     // start these browsers
     // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
-    browsers: ['PhantomJS'],
+    browsers: ['jsdom'],
 
 
     // Continuous Integration mode