Alexflipnote.py

- Added support for the new `sepia` filter.
- `snow` filter is more appealing (according to AlexFlipnote)
- Added `random` choice for `.filter()`.
- Added new Exception `InternalServerError` to handle.. internal server errors.
- Exceptions don't return any message anymore since it's impossible to get, for now.

- Added support for the new `wide` filter.

- Fixed `alexflipnote.Image.read()` raising a TypeError instead of returning BytesIO.

A complete rewrite which also removed the required package "url_regex".

- New icon for `.achievement()` and `.challenge()` "Oak log" at number 45,
- Added new support_server method to get an invitation to the AlexFlipnote's server,
- Added changelog and docs look a little better,
- Removed unnecessary things to make code smaller,
- Added type annotations & typehints for autocomplete things..?, better error handeling.
- Passing an Icon object to achievement and challenge now actually works.

I hope its faster and easier to use than ever with no breaking changes (hopefully)

- Fixed `.trash()` having the wrong url format.

- Fixed `.colourify()` not checking properly if color and background were `None`