Merge pull request #129 from yanamura/dependabot/npm_and_yarn/prettier-2.3.1

Bump prettier from 2.2.1 to 2.3.1

Author: yanamura

package-lock.json

@@ -21,7 +21,7 @@
         "eslint-plugin-github": "^4.1.2",
         "eslint-plugin-jest": "^24.3.6",
         "js-yaml": "^4.1.0",
-        "prettier": "^2.2.1",
+        "prettier": "^2.3.1",
         "ts-jest": "^27.0.3",
         "typescript": "^4.2.4"
     }