v0.6.0

This version makes breaking changes to most functions, and adds a few features, such as:

• Add revokeToken() in order to invalidate tokens manually
• Make request() public to allow users of this package to make more personalized requests
• Allow the automatic refresh of tokens upon getting 401 to be disabled
• Automatically refresh the token right before the expiration date by default
• Allow functions to be also called through namespaces

In addition, documentation should be more complete and organized than before

Full Changelog: v0.5.2...v0.6.0