Update changelog to include (hopefully) all changes.

Fix case when handling channel messages (request limiter)

Add custom_input for getUpdates method.

Fix indexed column length and quotes in comments.

Basic API 3.0 changes

Allow selecting channels with selectChats() and sendToActiveChats()

Use array for select-parameters, instead of individual parameters.

Fix #518  - Properly saving Chat IDs

Fix wrong datatype for message type.

Up and download folders are undefined by default

Allow setting a custom Guzzle HTTP Client for requests.