Update CHANGELOG for version 1.2.0 with recent changes

Author: mr-chetan

CHANGELOG.md

@@ -7,6 +7,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## 1.2.0
+- Add setName method to Tag and type to offsetGet paquettg/php-html-parser/pull/250
+- Update option names in README for consistency paquettg/php-html-parser/pull/253
+- Add object check for tag in parser paquettg/php-html-parser/pull/257
+- Handle null return from mb_ereg_replace in TextNode paquettg/php-html-parser/pull/260
+- Add ReturnTypeWillChange attribute to offsetGet paquettg/php-html-parser/pull/291
+- Fix typo in README example file name paquettg/php-html-parser/pull/295
+- Use getTag() method for tag access in Parser paquettg/php-html-parser/pull/311
+- Refactor encoding to use EncoderInterface paquettg/php-html-parser/pull/321
+- Fix typo and clear innerText in HtmlNode paquettg/php-html-parser/pull/324
+
 ## 1.1.0
 - Update dependency "devanoxltd/string-encoder" to version "^1.1".