Add missed crelt dependency

FIX: Properly add `crelt` as a dependency.

Author: frankvd

package.json

@@ -27,6 +27,7 @@
   "license": "MIT",
   "dependencies": {
     "@codemirror/state": "^6.5.0",
+    "crelt": "^1.0.6",
     "style-mod": "^4.1.0",
     "w3c-keyname": "^2.2.4"
   },