Transcript v0.1.0

• Remove header. Closes #29.
• Remove offset. Closes #28.
• Import transcript from Strata. Closes #27.
• Tidy package.json. See #22.
• Add license property to package.json. See #22.
• Add badges and links to README.md. Closes #22.
• Remove plain-test README. See #22.
• Add .npmignore. See #22.
• Update .gitignore. See #22.
• Build with Actions, ship coverage to Codecov. Closes #23. Closes #24.
• Update LICENSE for 2020. Closes #26.
• Rename t directory to test. See #22.
• Upgrade proof to 9.0.2. Closes #25.
• Convert README.md to Markdown. See #22.
• Remove Cadence dependency.
• Remove require.t.js.
• Tidy .travis.yml.
• Remove release.ft.
• Build on Travis without shipping to web server.

Closes #30.