Store realtime object to instance variable.

.ruby-version

@@ -0,0 +1 @@
+2.4.0

examples/rtm.rb

@@ -4,6 +4,12 @@
 token = ENV["TOKEN"] || (print "Token: "; gets.strip)
 client = Slack::Client.new token: token
 
+#rtm = client.realtime
+client.realtime.on :message do |m|
+  p m
+end
+client.realtime.start
+
 rtm = client.realtime
 rtm.on :message do |m|
   p m

lib/slack/api.rb

@@ -23,7 +23,7 @@ def initialize(options={})
     include Endpoint
 
     def realtime
-      RealTime::Client.new(post("rtm.start"))
+      @realtime ||= RealTime::Client.new(post("rtm.start"))
     end
   end
 end