The config file wasn't changed.

Changelog v0.15.3:
- fixed speed false positives when running across the edge of ice
- fixed flight false positives when jumping on the edge of slime blocks
- fixed speed false positives when hitting entities while sprinting
- fixed speed false positives when beginning to move with slowness
- fixed boat movement false positives when going over a mix of ice and water
- added getTps() and getPing(player) functions to the API, note that getPing might return null if no ping was measured yet