feat: use latest code coverage plugin

Author: bahmutov

package-lock.json

@@ -63,7 +63,7 @@
     "url": "https://github.com/bahmutov/cypress-react-unit-test.git"
   },
   "dependencies": {
-    "@cypress/code-coverage": "2.0.3",
+    "@cypress/code-coverage": "3.0.0",
     "@cypress/webpack-preprocessor": "4.1.3",
     "babel-plugin-istanbul": "6.0.0",
     "debug": "4.1.1",

package.json

@@ -2,5 +2,8 @@ const filePreprocessor = require('./file-preprocessor')
 
 module.exports = (on, config) => {
   on('file:preprocessor', filePreprocessor(config))
-  on('task', require('@cypress/code-coverage/task'))
+  on('task', require('@cypress/code-coverage/task')(on, config))
+  // IMPORTANT to return the config object
+  // with the any changed environment variables
+  return config
 }