Lower Fsharp.Core requirements

Update to Thoth.Json v6

Update to Thoth.Json v4

Release 2.0.0

Fix #13: Only consume body when http code doesn't cause immediate rejection (by @WalternativE)

Fix #8: Option to pass additional headers (by @SCullman)

Fix #9: Data is now optional for all http methods including GET (by @SCullman)

Fix #11: Decoders/ encoders are not cached within Json.Fetch (by @SCullman)

Fix #7: Better error reports with FetchError (by @SCullman)

Fix #5: Response type can now be unit (by @SCullman)

Use !^ operator to be agnostic of union case rank like U2, U3, etc. (by @SCullman)

Add documentation for all the methods

Fix #1: Rename init parameter to properties

Initial release