Update dependency prettier to v2.8.7

Author: renovate[bot]

package.json

@@ -34,7 +34,7 @@
     "ts-node-dev": "1.0.0-pre.44",
     "lint-staged": "10.1.3",
     "husky": "4.2.5",
-    "prettier": "2.0.4",
+    "prettier": "2.8.7",
     "eslint": "6.8.0",
     "eslint-config-prettier": "6.10.1",
     "eslint-config-standard": "14.1.1",