v9.6.0

Added

• Pull #497: Transient Fault Handling
• Thanks to Dylan Morley for the PR!

This PR implements retry behaviour for transient faults when using HttpClient to send the request.

• For full backwards compatibility, default behaviour of retry logic is off. Consumer of the library must explicitly enable this using the ReliabilitySettings
• Retry logic implemented as a delegating handler in the HttpClient handlers pipeline
• New object ReliabilitySettings defines retry count and retry interval. Setting retry count > 0 enables the behaviour.
• New object SendGridClientOptions defines the settings to use with SendGridClient, and new ctor allows this object,

Here is an example of usage.