chore(deps): bump html2rss from 6b43db1 to 20731ec

Bumps [html2rss](https://github.com/html2rss/html2rss) from `6b43db1` to `20731ec`.
- [Release notes](https://github.com/html2rss/html2rss/releases)
- [Commits](html2rss/html2rss@6b43db1...20731ec)

---
updated-dependencies:
- dependency-name: html2rss
  dependency-version: 20731ec7324e9ece01e9ad02dd19778137848a71
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -12,7 +12,7 @@ GIT
 
 GIT
   remote: https://github.com/html2rss/html2rss
-  revision: 6b43db180b37e811d2a3be06dafef3ed700e4a86
+  revision: 20731ec7324e9ece01e9ad02dd19778137848a71
   branch: master
   specs:
     html2rss (0.17.0)