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.