Update dev-dependencies

Author: wooorm

package.json

@@ -35,12 +35,12 @@
     "micromark": "~2.9.0"
   },
   "devDependencies": {
-    "mdast-util-from-markdown": "^0.7.0",
+    "mdast-util-from-markdown": "^0.8.0",
     "micromark-extension-footnote": "~0.3.0",
     "nyc": "^15.0.0",
     "prettier": "^2.0.0",
-    "remark-cli": "^8.0.0",
-    "remark-preset-wooorm": "^7.0.0",
+    "remark-cli": "^9.0.0-alpha.1",
+    "remark-preset-wooorm": "^8.0.0",
     "tape": "^5.0.0",
     "xo": "^0.33.0"
   },