Add missing types dependency

Closes GH-3.

Author: Methuselah96

package.json

@@ -38,12 +38,12 @@
     "index.js"
   ],
   "dependencies": {
+    "@types/mdast": "^3.0.0",
     "markdown-table": "^3.0.0",
     "mdast-util-from-markdown": "^1.0.0",
     "mdast-util-to-markdown": "^1.3.0"
   },
   "devDependencies": {
-    "@types/mdast": "^3.0.0",
     "@types/tape": "^4.0.0",
     "c8": "^7.0.0",
     "micromark-extension-gfm-table": "^1.0.0",