[Fix #2421] Use the right version comparison function

Otherwise when you're on the minimum required version you'd
get a warning.

Author: bbatsov

cider-connection.el

@@ -207,7 +207,7 @@ message in the REPL area."
      ((null middleware-version)
       (cider-emit-manual-warning "troubleshooting/#cider-complains-of-the-cider-nrepl-version"
                                  "CIDER requires cider-nrepl to be fully functional. Many things will not work without it!"))
-     ((version<= middleware-version cider-required-middleware-version)
+     ((version< middleware-version cider-required-middleware-version)
       (cider-emit-manual-warning "troubleshooting/#cider-complains-of-the-cider-nrepl-version"
                                  "CIDER %s requires cider-nrepl %s+, but you're currently using cider-nrepl %s. Things will break!"
                                  cider-version cider-required-middleware-version middleware-version)))))