Add CHANGELOG entry

CocoaPods · Sep 27, 2019 · 2f2b932 · 2f2b932
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -12,6 +12,10 @@
   [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
   [#592](https://github.com/CocoaPods/Core/pull/592)
 
+* Update `concurrent-ruby` gem dependency to '\~> 1.1'.  
+  [Igor Makarov](https://github.com/igor-makarov)
+  [#591](https://github.com/CocoaPods/Core/pull/591)
+
 
 ## 1.8.0 (2019-09-23)