Add Discord User-Agent

[phdavis]

Description

• Add Discord User-Agent to Invoke-RestMethod
• Change Discord API URL from discordapp.com/api to discord.com/api

Related Issue

239

Motivation and Context

Resolves error/s mentioned in linked issue.

How Has This Been Tested?

Forked repo, made adjustments, ran build, imported, and manually tested without issue. PSVersion 7.2.1 PSEdition Core OS Microsoft Windows 10.0.19043

Screenshots (if appropriate):

Types of changes

• [x] 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 change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[scrthq]

@phdavis I've confirmed these work in my Discord PoshBot instance as well, nice find and fix! CC @devblackops

[devblackops]

Thanks @phdavis! I did a quick test as well. No issues.