Various improvements + upgraded to dotnet v6

Updated to dotnet v6 as v5 is no longer supported
Various improvements in document feed kudos to @GeertenPitcrew
Align tags with version in nuget

Notabel changes include async + mandate feed improvements

Full Changelog: v1.0.3...v1.0.4

Added cancel + detail endpoints

Added:

• cancel mandates (sync + async)
• retrieve a single status of a mandate (rate-limits apply)

Added idempotency header

Minor release with following changes:

• addition of Idempotency headers
• added function for remove/cancel mandate
• added function for removal of a transaction provided it wasn't sent to the bank yet

Kudos to M0nkor

Release 1.0.0

Major (but breaking changes)

• Refactored the callbacks into more user friendlier generators
• Added model classes to avoid working with dictionaries

Special thanks to Ruben De Smedt

First release to NuGet

v0.1.0

CI/CD publish README