update changelog 1.2.0

Author: seanlynchwv

docs/changes/1.2.0.md

@@ -30,6 +30,7 @@
 - ODPresentation Reader : Read differents units for margin by [@Progi1984](https://github.com/Progi1984) fixing [#830](https://github.com/PHPOffice/PHPPresentation/pull/830) in [#847](https://github.com/PHPOffice/PHPPresentation/pull/847)
 - PowerPoint2007 Reader : Fixed loading of fonts by [@ag3202](https://github.com/ag3202) and [@Progi1984](https://github.com/Progi1984) in [#851](https://github.com/PHPOffice/PHPPresentation/pull/851)
 - PhpOffice\PhpPresentation\Style\TextStyle : Fixed typo for default indent by [@Progi1984](https://github.com/Progi1984) in [#857](https://github.com/PHPOffice/PHPPresentation/pull/857)
+- Fixed adding custom SVGs by [@seanlynchwv](http://github.com/seanlynchwv) in [#881](https://github.com/PHPOffice/PHPPresentation/pull/881)
 
 ## Miscellaneous
 - CI: Added ODFValidator by [@Progi1984](https://github.com/Progi1984) fixing [#678](https://github.com/PHPOffice/PHPWord/issues/678) in [#653](https://github.com/PHPOffice/PHPWord/pull/653)