CSS Grid Property is not valid

[lightbringer1991]

I am using stylus with CSS Grid properties

.random-element
  display: grid
  grid-column-gap: 10px
  grid-row-gap: 10px

However the stylint comes back with

test.styl
3:2 valid error property is not valid

test.styl
4:2 valid error property is not valid

I'm using Stylint v1.5.9, tried upgrading to v2.0.0 but having the same result.
Webpack stylus loader is working fine.

[koynoyno]

Add

"customProperties": ['grid-column-gap', 'grid-row-gap'],

line to your .stylintrc file.