Update Readme.scalatex

Author: lihaoyi

upickleReadme/Readme.scalatex

@@ -28,10 +28,6 @@
 @sect("uPickle 4.1.0")
   @div(display.flex, alignItems.center, flexDirection.column)
     @div
-      @a(href := "https://gitter.im/lihaoyi/upickle")(
-        img(src := "https://badges.gitter.im/Join%20Chat.svg")
-      )
-      @span(" ")
       @a(href := "https://www.patreon.com/lihaoyi")(
         img(src := "https://img.shields.io/badge/patreon-sponsor-ff69b4.svg")
       )