Python-bitvavo-api

Fixes
====
- Changes the configuration of the Python SDK to allow using a version range for the dependencies. This should prevent us from using code which contains a vulnerability.

Update the date in the license file.

Features
- Adds a new method to get fees via [a new endpoint](https://docs.bitvavo.com/#tag/Account-endpoints/paths/~1account~1fees/get)

Call the following method to access the fees:
py
from python_bitvavo_api.bitvavo import Bitvavo

bitvavo = Bitvavo('<APIKEY>', '<APISECRET>')
response = bitvavo.fees()


You can also pass a market to get fees for that specific market:
py
from python_bitvavo_api.bitvavo import Bitvavo

bitvavo = Bitvavo('<APIKEY>', '<APISECRET>')
response = bitvavo.fees(market = 'BTC-EUR')


Fixes
- Fixes and issue with waiting for the WebSocket connection to be authenticated

Add the contributing guide to this repository.

Features
- Allows setting a `'TIMEOUT'` option which is applied to all outgoing REST requests
- Allows passing options as arguments to the candles endpoint

In this release we have:
* Improved the WebSocket implementation.
* Updated the Readme.