Update README.md

active-hash · Sep 28, 2019 · 8d7fa60 · 8d7fa60
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@@ -15,6 +15,14 @@ ActiveHash also ships with:
   * ActiveFile: a base class that you can use to create file data sources
   * ActiveYaml: a base class that will turn YAML into a hash and load the data into an ActiveHash object
 
+## !!! Important notice !!!
+We have changed returned value to chainable by v3.0.0. It's not just an `Array` instance anymore.
+If it breaks your application, please report us on [issues](https://github.com/zilkey/active_hash/issues), and use v2.x.x as following..
+
+```ruby
+gem 'active_hash', '~> 2.3.0'
+```
+
 ## Installation
 
 Bundler: