Replace findup by @choojs/findup (#153)

@choojs/findup is a fork of findup that removes the `colors` dependency.
`colors` adds lots of properties to the String prototype, which was
causing big slowdowns in bankai. About 300ms was spent calling `colors`
getters that were never expected to be there (mostly by clean-css).

Author: goto-bus-stop

package.json

@@ -21,9 +21,9 @@
     "css-modules"
   ],
   "dependencies": {
+    "@choojs/findup": "^0.2.0",
     "acorn-node": "^1.3.0",
     "fast-json-parse": "^1.0.2",
-    "findup": "^0.1.5",
     "insert-css": "^2.0.0",
     "map-limit": "0.0.1",
     "postcss": "^5.0.10",

transform.js

@@ -2,9 +2,9 @@ const cssResolve = require('style-resolve').sync
 const transformAst = require('transform-ast')
 const staticEval = require('static-eval')
 const parse = require('fast-json-parse')
+const findup = require('@choojs/findup')
 const mapLimit = require('map-limit')
 const through = require('through2')
-const findup = require('findup')
 const xtend = require('xtend')
 const path = require('path')
 const fs = require('fs')