Prep release notes for v2.4.0-beta-1

Fixes #146 - Better support for `CancellationToken`. Clean up of toke…

…n registrations that may produce exceptions when `CancellationTokenSource.Cancel()` is called. Basic idea here is to have the caller of `CancellationTokenSource.Cancel()` dispose of the `CancellationTokenRegistration` and have the message pump worker tasked with finishing the Awatier task continuations dispose of `CancellationTokenRegistration` when it's done via using statement.

Prepare for new release. Fix the music wall.

doc update

Java driver keeps track of the original cursor Query for exception re…

…porting. Re #138.

Rename val parameters on Connection.Builder for better readability.

Version HISTORY.md

Fixes #125, use the configured NamingStrategy when translating linq q…

…ueries. (#126)

* Fixes #125, use the configured NamingStrategy when translating linq queries.

* Update HISTORY.md changes.

Migrate to .NET Standard 2.0. 🚚 (#120)

Fixes #113, allow client-side generation of ReGrid file ids. (#114)

Fixes #112; however, might cause regression in #62.