Update the [configuration file generator](https://github.com/mapbox/guidance-sim/blob/93c503a89456125b750775581ceca3bc71d82fc5/lib/validate.js) to reflect the following changes: - [ ] v4 Directions API routes can now jibe with `"spacing": "acceldecel"` mode
Update the configuration file generator to reflect the following changes:
"spacing": "acceldecel"mode