feat: use new license format

Zxilly · Zxilly · commit 284d2a48cd67 · 2021-07-19T23:21:55.000+08:00
Signed-off-by: Zxilly &lt;zhouxinyu1001@gmail.com&gt;
diff --git a/package.json b/package.json
@@ -64,12 +64,7 @@
     "type": "git",
     "url": "https://github.com/casbin/node-casbin.git"
   },
-  "licenses": [
-    {
-      "type": "Apache-2.0",
-      "url": "http://www.apache.org/licenses/LICENSE-2.0"
-    }
-  ],
+  "license": "Apache-2.0",
   "husky": {
     "hooks": {
       "prepare-commit-msg": "exec < /dev/tty && git cz --hook || true",
