fix(deps): update dependency eslint-plugin-markdown to v3 (#532)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Simon Knott <[email protected]>

Author: renovate[bot]

package-lock.json

@@ -95,7 +95,7 @@
     "eslint-plugin-fp": "^2.3.0",
     "eslint-plugin-html": "^6.1.0",
     "eslint-plugin-import": "^2.25.1",
-    "eslint-plugin-markdown": "^2.0.0",
+    "eslint-plugin-markdown": "^3.0.0",
     "eslint-plugin-n": "^14.0.0",
     "eslint-plugin-promise": "^6.0.0",
     "eslint-plugin-react": "^7.21.5",