add require

kimoto · kimoto · commit d3adbfaace48 · 2019-03-04T20:16:55.000+09:00
diff --git a/lib/line/bot/event.rb b/lib/line/bot/event.rb
@@ -21,3 +21,5 @@
 require 'line/bot/event/message'
 require 'line/bot/event/postback'
 require 'line/bot/event/unfollow'
+require 'line/bot/event/member_joined'
+require 'line/bot/event/member_left'
