Need to add key to .plist

ionic-v1
1

I need to add the following settings to my ionic plist file, however, the app wont build after I add it.

  <key>NSAppTransportSecurity</key>
  <dict>
    <key>NSAllowsArbitraryLoads</key>
    <true/>
  </dict>

I am not sure where I should add it.