chore: switch to chrome headless

.travis.yml

@@ -6,5 +6,5 @@ before_script:
   - "sh -e /etc/init.d/xvfb start"
   - sleep 3
 addons:
-  firefox: "latest"
-script: "./node_modules/karma/bin/karma start test/karma.conf.js --browsers Firefox --single-run --no-auto-watch --capture-timeout 300000"
+  chrome: stable
+script: "./node_modules/karma/bin/karma start test/karma.conf.js --browsers Chrome --single-run --no-auto-watch --capture-timeout 300000"

package.json

@@ -26,8 +26,6 @@
   },
   "homepage": "https://github.com/jasonslyvia/react-lazyload",
   "devDependencies": {
-    "prop-types": "^15.5.6",
-    "react-transition-group": "1.x",
     "babel-cli": "^6.24.0",
     "babel-core": "^6.24.0",
     "babel-eslint": "^7.1.1",
@@ -47,17 +45,20 @@
     "istanbul-instrumenter-loader": "^0.2.0",
     "karma": "^0.13.22",
     "karma-chai": "^0.1.0",
+    "karma-chrome-launcher": "^2.2.0",
     "karma-coverage": "^0.5.5",
     "karma-coveralls": "^1.1.2",
     "karma-firefox-launcher": "^1.0.1",
     "karma-mocha": "^0.2.2",
     "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^1.7.0",
     "mocha": "^2.2.5",
+    "prop-types": "^15.5.6",
     "react": "^16",
     "react-dom": "^16",
     "react-hot-loader": "~1.3.1",
     "react-router": "^3",
+    "react-transition-group": "1.x",
     "webpack": "~1.11.0",
     "webpack-dev-server": "~1.10.1"
   },

test/karma.conf.js

@@ -63,7 +63,7 @@ module.exports = function (config) {
       'karma-coverage',
       'karma-chai',
       'karma-sourcemap-loader',
-      'karma-firefox-launcher',
+      'karma-chrome-launcher',
       'istanbul-instrumenter-loader',
       'karma-coveralls'
     ],
@@ -106,7 +106,7 @@ module.exports = function (config) {
 
     // start these browsers
     // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
-    browsers: ['Firefox'],
+    browsers: ['Chrome'],
 
     browserNoActivityTimeout: 300000,
     browserDisconnectTimeout: 300000,