react-native-incall-manager: undefined is not an object _InCallManager.start

For anyone that has an issue with Android, I had to manually add the following to MainApplication.java

import com.zxcpoiu.incallmanager.InCallManagerPackage;

    @Override
    protected List<ReactPackage> getPackages() {
      mReactNativePushNotificationPackage = new ReactNativePushNotificationPackage();
      return Arrays.<ReactPackage>asList(
          new InCallManagerPackage(),
      );
    }