Change to warning.

Author: ioquatix

lib/async/http/faraday/adapter.rb

@@ -57,7 +57,9 @@ def initialize(options = {})
 				end
 
 				def run
-					raise NotImplementedError, "Please update your Faraday version!"
+					if $VERBOSE
+						warn "Please update your Faraday version!", uplevel: 2
+					end
 				end
 
 				def async(&block)