Merge pull request #92 from assetgraph/depfu/update/npm/prettier-2.8.0

Upgrade prettier to version 2.8.0

Author: papandreou

package.json

@@ -56,7 +56,7 @@
     "mocha": "^8.2.1",
     "nyc": "^15.0.0",
     "offline-github-changelog": "^3.0.0",
-    "prettier": "~2.7.0",
+    "prettier": "~2.8.0",
     "systemjs-builder": "0.16.15",
     "temp": "^0.9.4",
     "unexpected": "^13.0.0"