feat: full upgrade to python3, tests, etc.

.github/CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation
+in our community a harassment-free experience for everyone, regardless
+of age, body size, visible or invisible disability, ethnicity, sex
+characteristics, gender identity and expression, level of experience,
+education, socio-economic status, nationality, personal appearance,
+race, caste, color, religion, or sexual identity and orientation.
+
+We pledge to act and interact in ways that contribute to an open,
+welcoming, diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment:
+- Demonstrating empathy and kindness
+- Being respectful of differing opinions
+- Gracefully accepting constructive feedback
+- Focusing on what is best for the community
+
+Examples of unacceptable behavior:
+- The use of sexualized language or imagery
+- Trolling, insulting or derogatory comments
+- Harassment of any kind
+- Publishing others’ private information
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our
+standards and will take appropriate and fair corrective action in
+response to any behavior they deem inappropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces and also
+applies when an individual is officially representing the project.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior
+may be reported to the project owner @ivuorinen.
+
+All complaints will be reviewed and investigated and will result in a
+response that is deemed necessary and appropriate to the circumstances.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][cc],
+version 2.1.
+
+[cc]: https://www.contributor-covenant.org/version/2/1/code_of_conduct/
+
+<!--
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+-->