Update dev-dependencies

Author: wooorm

package.json

@@ -52,7 +52,7 @@
     "mdast-util-from-markdown": "^1.0.0",
     "mdast-util-to-hast": "^11.0.0",
     "mdast-util-to-markdown": "^1.0.0",
-    "micromark-extension-gfm": "^1.0.0",
+    "micromark-extension-gfm": "^2.0.0",
     "node-fetch": "^3.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^10.0.0",