Remove unused dep

Author: dy

package.json

@@ -87,7 +87,6 @@
     "has-hover": "^1.0.1",
     "has-passive-events": "^1.0.0",
     "mapbox-gl": "0.44.1",
-    "math-log2": "^1.0.1",
     "matrix-camera-controller": "^2.1.3",
     "mouse-change": "^1.4.0",
     "mouse-event-offset": "^3.0.2",