Microsoft OAuth2

[codefiesta]

Description

Encodes the /token urls as 'application/x-www-form-urlencoded' to be compliant with Microsoft OAuth2 endpoints.
Regression testing performed on Github & Google providers.

Shout out to this artticle on Medium: Swift: How to create a HTTP POST request with “application/x-www-form-urlencoded” body for the solution

Fix: #35

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules