Fix typo'd unit name

macrovision.js

@@ -279,7 +279,7 @@ const defaultUnits = {
         metric: "liters",
         customary: "gallons",
         relative: "olympicPools",
-        volume: "barnmegaparsecs"
+        volume: "barnMegaparsecs"
     },
     mass: {
         metric: "kilograms",