use permitted svg source

Author: mikeebowen

README.md

@@ -1,4 +1,5 @@
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+[![VS Marketplace](https://img.shields.io/visual-studio-marketplace/v/mikeebowen.ooxml-validator-vscode?label=VS%20Marketplace&color=green
+)](https://marketplace.visualstudio.com/items?itemName=mikeebowen.ooxml-validator-vscode)
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