Bump showdown from 2.0.3 to 2.1.0 (#992)

Bumps [showdown](https://github.com/showdownjs/showdown) from 2.0.3 to 2.1.0.
- [Release notes](https://github.com/showdownjs/showdown/releases)
- [Changelog](https://github.com/showdownjs/showdown/blob/2.1.0/CHANGELOG.md)
- [Commits](https://github.com/showdownjs/showdown/compare/2.0.3...2.1.0)

---
updated-dependencies:
- dependency-name: showdown
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -24,6 +24,6 @@
     "fs-extra": "10.1.0",
     "node-fetch": "3.2.3",
     "rimraf": "3.0.2",
-    "showdown": "^2.0.3"
+    "showdown": "^2.1.0"
   }
 }