+tests for utils, fix UNAME_RE

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.12.12",
+    "version": "2.12.13",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
@@ -70,4 +70,4 @@
         "build": "tsc",
         "build:watch": "tsc --watch"
     }
-}
+}