Update dev-dependencies

Author: wooorm

package.json

@@ -44,11 +44,11 @@
   "devDependencies": {
     "github-slugger": "^1.0.0",
     "hast-util-to-html": "^7.0.0",
-    "mdast-util-from-markdown": "^0.5.0",
-    "mdast-util-to-hast": "^9.1.2",
+    "mdast-util-from-markdown": "^0.6.0",
+    "mdast-util-to-hast": "^9.0.0",
     "mdast-util-to-markdown": "^0.3.0",
-    "micromark-extension-gfm": "^0.1.0",
-    "node-fetch": "^2.6.1",
+    "micromark-extension-gfm": "^0.2.0",
+    "node-fetch": "^2.0.0",
     "nyc": "^15.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^8.0.0",