Update http4s-blaze-client, http4s-circe to 0.20.4 (#2699)
Update http4s-blaze-client, http4s-circe to 0.20.4 (#2699)

Update http4s-blaze-client, http4s-circe to 0.20.4
ChristopherDavenport/http4s,rossabaker/http4s,ChristopherDavenport/http4s,rossabaker/http4s,ChristopherDavenport/http4s,http4s/http4s