Support two-factor authentication #194
Description
Reddit has implemented two-factor authentication for accounts: https://old.reddit.com/r/announcements/comments/7spq3s/protect_your_account_with_twofactor_authentication/
If this is enabled, RedditSharp throws an exception when using Subreddit.SubmitPost : "Error when attempting to submit. Error: USER_REQUIRED" (even though the correct username and password are supplied)