Added 1.3.1 release notes

src/docs/releaseNotes/v1.3.1.md

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+# v1.3.1
+
+## Minor Changes
+
+- Fixed a bug where tokens that were placed on the map then removed from the token select screen could no longer be deleted from the map.
+- Fixed a bug where fog drawing couldn't be undone if there the last fog shape was deleted.
+- Added the ability to add multiple new maps or tokens at the same time.
+- Added a Show Grid option for maps that will overlay a grid on the map. This can be useful for when you have a map with no grid or you want to verify your current grid settings.
+- Added the ability to erase multiple shapes at a time by dragging over a shape with the eraser tool. This works for fog erase and toggle as well.
+
+[Reddit]()