bump podspec version after two cocoapods fixes.

Update README.md

Removing check boxes for `Arbitrary` conformance and `OpenAPI` integration. Both of these "features" are maintained in separate libraries.

Merge pull request mattpolzin#18 from mattpolzin/feature/match-jsonap…

…i-naming

Feature/match jsonapi naming

clarifying name change in tests. update documentation around entity d…

…irect subscript accessor

Merge pull request mattpolzin#17 from mattpolzin/swift-5

Default to Swift version 5.0 and Swift Tools version 5.0

Update cocoapods version, update readme to mention cocoapods support.

A bit more clarification/correction

Remove Playground page that used the OpenAPI support that has now mov…

…ed into its own repository.

update linuxmain

fix open API playground.