Anime-api

Fixed documentation links and updated the Studio Ghibli API endpoint.

New update!
- Fixes 30 (hmtai API was never down)

Updates:
- Added a new wrapper for the Catboys API (https://catboys.com/api).
- Updated the endpoint that the Nekos API wrapper uses by default. Nekos API has many endpoints (which all work), but since `nekos.nekidev.com` is deprecated it was changed to `https://api.nekosapi.com/v1`.
- Added a _down_ message in the main readme for Animu API since it is down and was now moved to `waifu.it`. Since the documentation is still missing I'll wait until the official docs get released before updating the endpoint.
- Finally a stable version. After lots of `0.X.X` versions, `1.0.0` is here.

TODOs for upcoming versions:
- Add a Nekos API v2 wrapper.
- Add more API wrappers.

Added new character metadata to Character object in Nekos API wrapper.

__Updates__:
- Added `get_characters()` method to the Nekos API wrapper (`NekosAPI`).

Added the new `NekosAPI.get_artists()` method for the `/artist` endpoint in the Nekos API wrapper.