Updated Changelog

Author: Progi1984

CHANGELOG.md

@@ -12,6 +12,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - HTML Reader : Support for `font-variant: small-caps` by @cambraca in #2117
 - Improved TextDirection for styling a cell by @terryzwt in #2429
 - Word2007 Reader : Added option to disable loading images by @aelliott1485 in #2450
+- HTML Writer : Added border-spacing to default styles by @kernusr in #2451
 ### Bug fixes
 
 - Fixed wrong mimetype for docx files by @gamerlv in #2416