Change order of closing connection.

Author: dblock

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 #### 0.8.2 (Next)
 
+* [#80](https://github.com/slack-ruby/slack-ruby-bot-server/pull/80): Fix: closed stream when closing connection in ping worker - [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 #### 0.8.1 (2018/9/20)

lib/slack-ruby-bot-server/ping.rb

@@ -72,9 +72,9 @@ def down!
 
     def restart!
       logger.warn "RESTART: #{owner}"
-      close_connection
       close_driver
       emit_close
+      close_connection
       false
     rescue StandardError => e
       logger.warn "Error restarting team #{owner.id}: #{e.message}."