5.0.0 Beta 1

First beta release of major version 5.

• Remove BoringSSL by @ptoffy @gwynne
• Add Sendable conformance by @ptoffy
• Add PSS algorithm family by @MFranceschi6
• Allow for header, parsing and serialising customisation by @ptoffy
• Replace JWTSigners with JWTKeyCollection by @ptoffy

For all changes check out #107