Remove echo

slack-mathbot/commands/echo.rb

@@ -1,13 +0,0 @@
-module SlackMathbot
-  module Commands
-    class Echo < SlackRubyBot::Commands::Base
-      command 'echo'
-
-      def self.call(client, data, match)
-        send_message client, data.channel, match[:expression]
-      rescue StandardError => e
-        send_message client, data.channel, "Sorry, #{e.message}."
-      end
-    end
-  end
-end