Checklist

[x] I have performed a self-review of my own code
[x] I have commented my code, particularly in hard-to-understand areas
[x] I have checked for similar issues and haven't found anything relevant.
[x] This is not a security issue (which should be reported here: https://circleci.com/security/)
[x] I have read Contribution Guidelines.

Changes

Updated code of conduct from code covenant v1.4 to v2.1