This repo's readme has a dead link in the to the Open Code of Conduct which no longer exists

> Description of problem

This link in this repo's readme: http://todogroup.org/opencodeofconduct/#GitHub%20Octocatalog-Diff/opensource@github.com

Gives Status code [404:NotFound]:

N/A for the questions below..
- What did you do?
- What happened?
- What did you expect to happen?
- How can someone reproduce the problem?

> Command used and debugging output

> Platform and version information
N/A

> Do the tests pass from a clean checkout?
N/A

> Anything else to add that you think will be helpful?

Should this repo has it's own Code Of Conduct, or use a general GitHub one?

Further info:
https://todogroup.org/blog/followup-open-code-of-conduct/
https://github.com/todogroup/opencodeofconduct

## Extra
I recently created a tool that uses the GitHub API to find bad links in repo's readme files:
https://github.com/MrCull/GitHub-Repo-ReadMe-Dead-Link-Finder

It can be used to re-check this repo: http://githubreadmechecker.com/Home/Search?SingleRepoUri=https%3a%2f%2fgithub.com%2fgithub%2foctocatalog-diff

I'd love to hear some feed back on this tool so please feel free to share any comments or thoughts.

Öffne die README des Repositorys und finde den nicht funktionierenden Link „Open Code of Conduct“. Prüfe die verlinkten Richtlinien und den Kontext des Repositorys, bevor du entscheidest, ob du ihn ersetzen oder entfernen solltest. Aktualisiere anschließend die README und überprüfe, dass der resultierende Link nicht mehr 404 zurückgibt.

Vom Indexierungsmodell aus dem Issue-Text verfasst.