Added v1.8.1 release notes

src/docs/releaseNotes/v1.8.1.md

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+## Minor Changes
+
+This release focuses on improving performance for map zooming and asset loading.
+
+- Custom tokens now share more data between each instance of a token saving on memory.
+- Zooming is more efficient by being better at choosing which elements need to be re-rendered.
+- Default image assets have been further compressed to save on network bandwidth.
+- Browser compatibility has been expanded by supporting older browsers that didn't previously work with moving maps or interacting with dice.
+- Sending larger maps to players will no longer hitch the UI while the map is cached.
+- Shared dice rolls now only show icons for the dice that have been rolled in the expanded view mode.
+- Holding down the Alt key while zooming will now activate a precision zoom mode, allowing mouse users to more precisely zoom maps.
+- The game reconnection message now has a more compact UI.
+
+---
+
+March 19 2021