Remove unused import

Author: bradlc

src/class-names/index.js

@@ -10,7 +10,6 @@ import invariant from 'tiny-invariant'
 import getPlugins from './getPlugins'
 import getVariants from './getVariants'
 import resolveConfig from './resolveConfig'
-import * as util from 'util'
 import * as path from 'path'
 import * as fs from 'fs'
 import { getUtilityConfigMap } from './getUtilityConfigMap'