Changelog For Get_User_Agent

`v0.1.1`

18.05.2022

Updated

This changelog
Updatd to Get_User_Agent 0.1.1
Updated Crate Name to Get_User_Agent in accordance with https://crates.io requirements.

`v0.1.1`

18.05.2022

Updatd to User_Agent 0.1.0
Improved upgrade code to be faster and more clean
Immediately fail if rate limit error occured

Added

This changelog
Error codes

Changed

Commented code better