Update README.md (#62)

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opal · Jul 4, 2016 · 815348e · 815348e
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diff --git a/README.md b/README.md
@@ -114,6 +114,8 @@ EventSource
 Event sources have been implemented and are easily configurable with blocks.
 
 ```ruby
+require 'browser/event_source'
+
 Browser::EventSource.new '/events' do |es|
   es.on :message do |e|
     alert e.data