Update releasenotes.md

Change the nuget job

Fixing more tests

Made the Parameter class no obsolete (restsharp#1644)

Unshallow

Unshallow

Removed the version attribute for restsharp#1504

Delete FUNDING.yml

Merge pull request restsharp#1498 from sharok/fix_oauth_encoding

Encode oauth_token. Fixes restsharp#1495

Wrap GetEncoding in try-catch to avoid platform-specific issues