Just pushed fix for Admob on iOS, was able to build this without any errors
plugins = {
-- Base
['plugin.appodeal.base'] = { publisherId = 'com.coronalabs' },
["plugin.appodeal.Amazon"] = {publisherId = 'com.coronalabs'},
['plugin.appodeal.Bidmachine'] = { publisherId = 'com.coronalabs' }, -- needs Amazon, Facebook, Vungle, MyTarget, and Pangle to build and this
['plugin.appodeal.GoogleAdMob'] = { publisherId = 'com.coronalabs' }, -- fix this
['plugin.appodeal.AppLovin'] = { publisherId = 'com.coronalabs' },
['plugin.appodeal.FacebookAudience'] = { publisherId = 'com.coronalabs' },
['plugin.appodeal.MyTarget'] = { publisherId = 'com.coronalabs' },
["plugin.appodeal.Pangle"] = {publisherId = 'com.coronalabs'},
['plugin.appodeal.Unity'] = { publisherId = 'com.coronalabs' },
['plugin.appodeal.Vungle'] = { publisherId = 'com.coronalabs' },
['plugin.appodeal.Yandex'] = { publisherId = 'com.coronalabs' }, -- working on this for iOS
["plugin.appodeal.InMobi"] = {publisherId = 'com.coronalabs'},
["plugin.facebook.v4a"] = {publisherId = 'com.coronalabs'},
["plugin.notifications.v2.firebase"] = {publisherId = 'com.coronalabs'},
As far as I can tell everything is good and Appodeal is updated 3.10 which is the latest as of posting, if any issues are occurring let me know 
