Fix deprecated TimeoutError constant

Author: daronco

lib/bigbluebutton_api.rb

@@ -731,7 +731,7 @@ def send_request(url, data=nil)
         end
         puts "BigBlueButtonAPI: URL response = #{response.body}" if @debug
 
-      rescue TimeoutError => error
+      rescue Timeout::Error => error
         raise BigBlueButtonException.new("Timeout error. Your server is probably down: \"#{@url}\". Error: #{error}")
 
       rescue Exception => error