Download chromium upon installation of mochify

Author: hackermd

package.json

@@ -25,9 +25,6 @@
     "url": "https://github.com/dcmjs-org/dicom-microscopy-viewer/issues"
   },
   "homepage": "https://github.com/dcmjs-org/dicom-microscopy-viewer#readme",
-  "config": {
-    "puppeteer_skip_chromium_download": true
-  },
   "devDependencies": {
     "chai": "^4.1.2",
     "mocha": "^5.2.0",