TODO
----
* Decrypt 'RepeatedForm' errors
* Show capchas to users if required
* Re-implement VK monad as a Free monad special case
* Runhaskell: handle some standard command line arguments
* Support storing access-tokens in a temp file

Version 1.7.2
-------------
* Initial support for runhaskell mode

Version 1.7.1
-------------

* Support setting IDv2 tags for downloaded audio files
* CLI: Fix 'call' command output
* CLI: Fix 'music' command naming


Version 1.6.0
-------------

* Use coroutine-based engine, offering smooth error handling
* Use pipes-http as network backend