Update dev dependencies.

karma.conf.js

@@ -1,30 +1,36 @@
-var webpackConfig = require('./webpack.config.js');
+var webpackConfig = require("./webpack.config.js");
 
 module.exports = function (karma) {
     karma.set({
-        plugins: ['karma-webpack', 'karma-chai', 'karma-sinon', 'karma-mocha', 'karma-chrome-launcher'],
+        plugins: [
+            "karma-webpack",
+            "karma-chai",
+            "karma-sinon",
+            "karma-mocha",
+            "karma-chrome-launcher",
+        ],
 
-        frameworks: ['chai', 'sinon', 'mocha'],
+        frameworks: ["chai", "sinon", "mocha", "webpack"],
 
         files: [
-            'src/**/*.js',
-            'test/**/*.js',
+            { pattern: "src/**/*.js", watched: false },
+            { pattern: "test/**/*.js", watched: false },
         ],
 
         preprocessors: {
-            'src/**/*.js': ['webpack'],
-            'test/**/*.js': ['webpack']
+            "src/**/*.js": ["webpack"],
+            "test/**/*.js": ["webpack"],
         },
 
         webpack: {
             module: webpackConfig.module,
-            plugins: webpackConfig.plugins
+            plugins: webpackConfig.plugins,
         },
 
         webpackMiddleware: {
-            stats: 'errors-only'
+            stats: "errors-only",
         },
 
-        browsers: ['ChromeHeadless']
+        browsers: ["ChromeHeadless"],
     });
 };