fix: upgrade cordova-plugin-ionic-webview from 4.1.3 to 4.2.0

Snyk has created this PR to upgrade cordova-plugin-ionic-webview from 4.1.3 to 4.2.0.

See this package in NPM:
https://www.npmjs.com/package/cordova-plugin-ionic-webview

See this project in Snyk:
https://app.snyk.io/org/marcusasplund/project/475ed275-e380-4f99-b9c1-3d111522f528?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package.json

@@ -26,7 +26,7 @@
     "cordova-android": "8.1.0",
     "cordova-plugin-camera": "4.1.0",
     "cordova-plugin-device": "2.0.3",
-    "cordova-plugin-ionic-webview": "4.1.3",
+    "cordova-plugin-ionic-webview": "4.2.0",
     "cordova-plugin-splashscreen": "5.0.3",
     "cordova-plugin-whitelist": "1.3.4",
     "ionic-angular": "3.9.10",