update plugin description (#71)

rdmueller · May 17, 2021 · e0d7c8e · e0d7c8e
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 <!-- Plugin description -->
 This unofficial extension integrates [diagrams.net](https://app.diagrams.net/)  (formerly known as draw.io) directly into IntelliJ.
-It supports diagram files with the extensions `.drawio.(svg|png)`.
+It supports diagram files with the extensions `.drawio.(svg|png|xml)` and `.dio.(svg|png|xml)`.
+It also auto-detects editable PNGs and SVGs created with diagrams.net.
+
+The editor uses an offline version of diagrams.net by default, therefore it works without an internet connection and content stays local in your IDE.
 <!-- Plugin description end -->
 
 ## About