Update CHANGELOG.md

ruby-concurrency · Oct 31, 2018 · ea7877d · ea7877d
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -16,6 +16,7 @@ concurrent-ruby-edge:
 
 concurrent-ruby:
 
+* requires at least Ruby 2.0
 * [Promises](http://ruby-concurrency.github.io/concurrent-ruby/1.1.0/Concurrent/Promises.html)
   are moved from `concurrent-ruby-edge` to `concurrent-ruby`
 * Add support for TruffleRuby