update changelog for 0.8.6

CHANGELOG.md

@@ -4,7 +4,7 @@
 * **Voltas, Tabs**: Fix regression in 0.8.5 where repetition volta shift and tabnote svg id were fixes were not applied (will soon be fixed by vexflow patch script)
 
 ### Miscellaneous
-* **Build**: Build size down to 1.1MB again from mysterious 1.3MB increase in 0.8.5
+* **Build**: Build size down to 1.1MB again from mysterious increase to 1.3MB in 0.8.5
 
 ## [0.8.5](https://github.com/opensheetmusicdisplay/opensheetmusicdisplay/compare/0.8.4...0.8.5) (2020-09-08)