Remove unused dependency

Closes GH-14.

Reviewed-by: Titus Wormer <tituswormer@gmail.com>

Author: bluwy

package.json

@@ -46,7 +46,6 @@
     "mdast-util-to-markdown": "^2.0.0",
     "parse-entities": "^4.0.0",
     "stringify-entities": "^4.0.0",
-    "unist-util-remove-position": "^5.0.0",
     "unist-util-stringify-position": "^4.0.0",
     "vfile-message": "^4.0.0"
   },
@@ -61,6 +60,7 @@
     "remark-preset-wooorm": "^9.0.0",
     "type-coverage": "^2.0.0",
     "typescript": "^5.0.0",
+    "unist-util-remove-position": "^5.0.0",
     "xo": "^0.58.0"
   },
   "scripts": {