V5.9.1

New Features:

- ETagMessageHandler is not supporting typeless entities. Issue [#172](https://github.com//issues/172)

Improvements & Fixes:

- POST with GeographyPoint throws object must implement IConvertable. Issue [#718](https://github.com//issues/718) - Model binding broken with enum keys. Issue [#724](https://github.com//issues/724) - Update enum property doesn't work. Issue [#742](https://github.com//issues/742) - Delta<T> should avoid static properties. Issue [#137](https://github.com//issues/137) - MaxExpansionDepth of 0 is not work. Issue [#731](https://github.com//issues/731) - EnumMember support without value. Issue [#697](https://github.com//issues/697) - Make IsIfNoneMatch public. Issue [#764](https://github.com//issues/764)

OData Web API v5.9.1 package has a dependency on OData v4 Lib 6.15.