Big fixes and minor improvements release

New:

• Support for IfFail in Try, TryOption, TryAsync, and TryOptionAsync - Thanks @mark-pro 👍
• Update prelude for Arithmetic typeclass - Thanks @benjstephenson 👍
• Improvements to the Effects samples

Bug fixes:

• Fix for EitherUnsafe MapLeft throws ResultIsNullException
• Fix for Stack overflow with MapT on T
• Fix for CancellationTokenSource not disposed