gut deps some more

Author: erickzhao

.npmignore

@@ -1,12 +1,12 @@
 'use strict'
 
 const fs = require('fs')
+const crypto = require('crypto')
 const colorConvert = require('color-convert')
 const getImageColors = require('get-image-colors')
 const mime = require('mime-types')
 const path = require('path')
 const pickAGoodColor = require('pick-a-good-color')
-const revHash = require('rev-hash')
 const stringify = require('json-stable-stringify')
 
 /**
@@ -23,7 +23,7 @@ async function getColors(slugsAndIconPaths, oldColors, root) {
       const slug = app.slug
       try {
         const data = fs.readFileSync(app.iconPath)
-        const hash = revHash(data)
+        const hash = crypto.createHash('sha256').update(data).digest('hex')
 
         // if nothing's changed, don't recalculate
         let o = oldColors[slug]