Define http4sVersion key to derive version for cross builds
Define http4sVersion key to derive version for cross builds

ZizhengTai/http4s,rossabaker/http4s,ChristopherDavenport/http4s,ChristopherDavenport/http4s,reactormonk/http4s,ZizhengTai/http4s,http4s/http4s,rossabaker/http4s,aeons/http4s,aeons/http4s,aeons/http4s,reactormonk/http4s,ChristopherDavenport/http4s,reactormonk/http4s,ZizhengTai/http4s