chore: Upgrade 'prettier' to v2

Author: medikoo

package.json

@@ -57,7 +57,7 @@
     "husky": "^4.2.5",
     "jest": "^26.0.1",
     "lint-staged": "^10.2.2",
-    "prettier": "^1.19.1",
+    "prettier": "^2.0.5",
     "sinon": "^7.5.0",
     "standard-version": "^7.1.0"
   },