removing Alex Johnson from code owners

Merge pull request #53 from plotly/add-code-of-conduct

adding code of conduct

updating year(s) in license

Update README.md with "maintained by Plotly" badge

Update CONTRIBUTING.md

Update CONTRIBUTING.md

Update README.md

Update CONTRIBUTING.md

Update FUNDING.yml

Use authentication with Docker Hub (#32)

Update to include CRAN badges

Fix CircleCI configuration problems with Python+Node (#26)

Fix build:all (#24)

Update CHANGELOG.md