Qtrade

In this small release I changed a method to be an internal method and fixed the docs.

In this release I have updated the docs theme to the read the docs theme and bumped the minimum version requirement for pyyaml to 5.1. Further, a few small typos were fixed.

In this small release we have added the option to either save the token payload in a yaml-file or not. Before, this was not optional. Further the name and path of the yaml-file can now be specified when either saving or updating the token via yaml. Lastly, the the default behaviour was changed to NOT save the tokens as a yaml-file by default. However, this can be easily changed when initiating the class via the new `save_yaml` attribute.

In this release the yaml load function was changed to be using the proper `FullLoader`.

This is the initial release of qtrade.