Release v19

Adding rewarded interstitial

Release v18

Moving Admob to use Firebase

Release v17

Fixed close event not firing issue on Android

Fixed close event not firing issue on Android

Release v16

Added Agramonte fix

"Fixed close / shown events not being fired"

Release v15

Fixing isLoaded and failed phase on load failure for Android

Release v14

Updating to 20.2.0 and moving to Adaptive Banners

Release v13

Fixed build for iOS

Release v12

Updating to match appodeal

Release v11

Adding maxAdContentRating

Release v10

Fixing AdMob rewarded initialization