Upgrade spec-md

Author: benjie

package-lock.json

@@ -15,7 +15,7 @@
     "cspell": "5.9.1",
     "nodemon": "2.0.12",
     "prettier": "^2.3.0",
-    "spec-md": "3.0.2"
+    "spec-md": "^3.1.0"
   },
   "prettier": {
     "proseWrap": "always",