Update Legit Phone Number Length to 16

Summary: Change the legit phone number length limit to allow 16 characters long.

Reviewed By: liliarizona

Differential Revision: D61604315

fbshipit-source-id: c6d85b8f842de5e37bbcb3ca978e26de3cff8040

lib/facebook_ads/ad_objects/server_side/util.rb

@@ -203,7 +203,7 @@ def self.normalize_phone(phone)
 					normalized_phone = normalized_phone.gsub(PHONE_NUMBER_DROP_PREFIX_ZEROS, '')
 				end
 
-				if normalized_phone.length < 7 || normalized_phone.length > 15
+				if normalized_phone.length < 7 || normalized_phone.length > 16
 					return nil;
 				end