0.12.0 readiness

Updates the CHANGELOG.md to set the release date.

Author: open-code-modeling-bot

CHANGELOG.md

@@ -2,27 +2,28 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## 0.12.0 - TBD
+## 0.12.0 - 2021-02-12
 
-### Added
 
-- Nothing.
+-----
 
-### Changed
+### Release Notes for [0.12.0](https://github.com/open-code-modeling/php-code-ast/milestone/26)
 
-- Nothing.
+Feature release (minor)
 
-### Deprecated
+### 0.12.0
 
-- Nothing.
+- Total issues resolved: **2**
+- Total pull requests resolved: **0**
+- Total contributors: **1**
 
-### Removed
+#### bug,enhancement
 
-- Nothing.
+ - [68: Fix default value code generation for properties and parameters](https://github.com/open-code-modeling/php-code-ast/issues/68) thanks to @sandrokeil
 
-### Fixed
+#### enhancement
 
-- Nothing.
+ - [67: Add support for code style in FileGenerator ](https://github.com/open-code-modeling/php-code-ast/issues/67) thanks to @sandrokeil
 
 ## 0.11.0 - 2021-01-30