Added Issue gitbrent#471 and Issue gitbrent#540

CHANGELOG.md

@@ -16,7 +16,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Ability to set start number "startAt" for a bullet list of type numbered [\#554](https://github.com/gitbrent/PptxGenJS/issue/554) [\#555](https://github.com/gitbrent/PptxGenJS/pull/555) ([bj-mitchell](https://github.com/bj-mitchell))
 - Tables not being displayed after update [\#559](https://github.com/gitbrent/PptxGenJS/issue/559) ([emartz404](https://github.com/emartz404))
 - Links in tables won't work on tables generated with autoPage [\#583](https://github.com/gitbrent/PptxGenJS/issue/583) ([githuis](https://github.com/githuis))
-
+- Set proper MIME type for PPTX presentation [\#471](https://github.com/gitbrent/PptxGenJS/issue/471) ([StefanBrand](https://github.com/StefanBrand))
+- Downloading PPT in iOS using Safari does not work. File named as UNKNOWN. [\#540](https://github.com/gitbrent/PptxGenJS/issue/540) ([mustafagentrit](https://github.com/mustafagentrit))
 
 
 ## [2.6.0] - 2019-??-??