Bump version 0.2.5

Bump version 0.2.4

Bump version 0.2.3

* Upgrade jiffy dependency

* Handle iolists in pe4kin_http:post body

* Upgrade dependencies, use hex instead of git

* Add a couple of CT test cases for longpoll
* Migrate to gun from hackney due to a hackney bug
  benoitc/hackney#464
* Some helpers to split long messages into multiple
* Some helpers to parse update messages

Update dependencies

* cowboy 1.1.2
* hackney 1.12.0
* jiffy 0.15.1

* API wrapper (supports media transfer)

* Update receiver
* Telegram data types helpers
* Emoji helper