Allow tabs in header value, fixes #2263

Don't allow CRLF in headers (#2258)

Added extensions for getting content header values (#2247)

Header value null check (#2241)

* Throw an exception when adding a header with `null` value
* Add multiple header values properly
* Default headers should allow multiple values

Syntax fix

Fix the XML docs

fix-auth (#2206)

* Add tests to OAuth1 signature and revert accidental authenticator renames

* Fix wrong timeout endpoint

Moved the changelog

Move the instantiation of RequestContent after calling the Authentica…

…tor (#2062)

* Move the instantiation of RequestContent after calling the Authenticator
* Add auth tests
* Fix null content issues with .NET Framework

Add `AddJsonBody` overload to serialise top-level string (#2043)

* Added AddJsonBody overload for top-level strings