Merge pull request #334 from github/tonkpils/faraday2-dual-compat

Support Faraday 2 alongside 1.x

updating the version and changelog

Version 6.2.3

version 6.2.1 with rethrottle support

Version 6.2.0 of elastomer client

Version 6.1.0

Version 6.0.4

Version 6.0.3

Version 6.0.2