chore(deps): bump turndown from 5.0.3 to 6.0.0

Bumps [turndown](https://github.com/domchristie/turndown) from 5.0.3 to 6.0.0.
- [Release notes](https://github.com/domchristie/turndown/releases)
- [Commits](mixmark-io/turndown@v5.0.3...v6.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -22,7 +22,7 @@
   "dependencies": {
     "async": "^3.1.0",
     "request": "^2.36.0",
-    "turndown": "^5.0.3",
+    "turndown": "^6.0.0",
     "xml2js": "^0.4.19"
   },
   "devDependencies": {