Bump class-transformer from 0.2.3 to 0.3.1

Bumps [class-transformer](https://github.com/typestack/class-transformer) from 0.2.3 to 0.3.1.
- [Release notes](https://github.com/typestack/class-transformer/releases)
- [Changelog](https://github.com/typestack/class-transformer/blob/develop/CHANGELOG.md)
- [Commits](typestack/class-transformer@v0.2.3...v0.3.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -18,7 +18,7 @@
     "@types/node": "12.12.7",
     "bcrypt": "^5.0.0",
     "body-parser": "1.19.0",
-    "class-transformer": "^0.2.3",
+    "class-transformer": "^0.3.1",
     "class-validator": "0.11.0",
     "cookie-parser": "1.4.4",
     "cors": "2.8.5",