v0.3.1

Added

• Lots more tests
• Query and Endpoint classes now have a public Options property to read the options that were passed to them.
• Query now has a CurrentQuery property to get the FixedQuery that it is currently observing.
• New KeySelector option to customize the value used for caching query arguments.
• Support for infinite StaleTime by passing a negative value

Changed

• RefetchAsync and similar methods now return the result data from the query.

Fixed

• BREAKING CHANGE: Query.Refetch now throws an exception if it is un-initialized, instead of failing silently.
• null can now be used as a query argument.
• Fixed bug where large StaleTime values (e.g., `TimeSpan.MaxValue) would cause an overflow.