adjust turndown dependency

Author: guyplusplus

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@guyplusplus/turndown-plugin-gfm",
   "description": "Turndown plugin to add GitHub Flavored Markdown extensions.",
-  "version": "1.0.5",
+  "version": "1.0.6",
   "author": "Dom Christie",
   "main": "lib/turndown-plugin-gfm.cjs.js",
   "module": "lib/turndown-plugin-gfm.es.js",
@@ -10,9 +10,11 @@
     "browserify": "^16.2.3",
     "rollup": "^1.32.0",
     "standard": "^10.0.3",
-    "turndown": "7.0.0",
     "turndown-attendant": "0.0.3"
   },
+  "dependencies": {
+    "turndown": "^7.0.0"
+  },
   "files": [
     "lib",
     "dist"