Update CHANGELOG.md [ci skip]

mpeterv · Sep 8, 2017 · d8d639f · d8d639f
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 # Change Log
 
+## 0.21.1 (unreleased)
+
+### Fixes
+
+* Added missing definition of `ngx.ERROR` constant to `ngx_lua` std (#123).
+
 ## 0.21.0 (2017-09-04)
 
 ### New features and improvements