Update Dropbox API from v1 to v2

[karbassi]

Since Dropbox API v1 is fully shutdown, the iOS app needs to be updated to v2.

[karbassi]

Update: Someone is looking into it.

[talgalili]

Great, thanks. I'm missing todo.txt ...

[ginatrapani]

Hi all -- I just posted this to the blog and the mailing list regarding this issue: http://blog.todotxt.org/post/166157430787/todotxt-for-android-and-ios-stopped-syncing-to

[jakeosx]

just wanted to add an alternative for iPhone users. Swift Todo is a fantastic app.

http://swiftodoapp.com/

same developer as TodoTxtMac (which is how I found it).