✏️ docs|Changelog|Add v0.9.9 changes

Changelog.md

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+# 0.9.9
+Moved token movement history to a flag, which now takes advantage of the Foundry undo system so that when undoing token movement during combat, the token's movement history is reset accordingly.
+Added a button in the Combat Tracker that GMs can use to reset the current combatant movement history during combat. Closes #89.
+
+Fix for ruler display ghosting on other users' displays. Closes #124, #134.
+Fix for elevation changing too much when using hotkeys. Closes #126.
+
 # 0.9.8
 Fix for `FLAGS` not defined error.
 Round prior movement label.