udpate changelog

Author: spipu

CHANGELOG.md

@@ -8,7 +8,7 @@ All notable changes to this project will be documented in this file.
   * improve Security service to be able to allow specific hosts
   * update doc about Security service
   * fix security issue on css background-image validation - thanks to Aleksey Solovev and Nikita Sveshnikov ([Positive Technologies](https://www.ptsecurity.com))
-  * fix security issue on image src validation - thanks to Aleksey Solovev ([Positive Technologies](https://www.ptsecurity.com))
+  * fix security issue on image src validation - thanks to Aleksey Solovev and Nikita Sveshnikov ([Positive Technologies](https://www.ptsecurity.com))
   * fix on Index creation if no bookmark - thanks to @rhulha
   * fix tables getting moved to other pages and breaking styles by using specific class `html2pdf-same-page` on div container - thanks to @macr1408