Locket v2.0.0-alpha.0

• Upgrade b-tree to 2.0.0-alpha.106.
• Upgrade writeahead to 0.0.40.
• Upgrade fracture to 0.3.0-alpha.62.
• Upgrade amalgamate to 0.1.64.
• Upgrade destructible to 7.0.0-alpha.63.
• Upgrade rescue to 7.0.0-alpha.14.
• Upgrade magazine to 6.0.0-alpha.7.
• Update LICENSE for 2021.
• Build with Node.js 14, 15 on Travis CI.
• With with Node.js 14, 15 at Travis CI.
• Update for upgraded dependencies.
• Upgrade b-tree to 2.0.0-alpha.105.
• Upgrade satiate to 0.0.2.
• Upgrade amalgamate to 0.1.63.
• Upgrade constrain to 2.0.0-alpha.3.
• Upgrade reciprocate to 0.0.6.
• Upgrade destructible to 7.0.0-alpha.62.
• Upgrade extant to ^2.0.0-alpha.0.
• Upgrade rescue to 7.0.0-alpha.13.
• Upgrade cadence to 4.0.0-alpha.1.
• Remove rimraf dependency.
• Replace Prospective with Comeuppance.
• Upgrade tape to 5.2.2.
• Upgrade amalgamate to 0.1.38. Closes #257.
• Upgrade b-tree to 2.0.0-alpha.66. Closes #256.
• Use new constrain iterator decorator. Closes #255.
• Upgrade amalgamate to 0.1.37. Closes #254.
• Upgrade constrain to 2.0.0-alpha.1. Closes #253.
• Upgrade satiate to 0.0.1. Closes #252.
• Remove Riffle depdendency. Closes #251.
• Upgrade b-tree to 2.0.0-alpha.65. Closes #250.
• Convert to Cadence. Closes #249.
• Upgrade reciprocate to 0.0.2. Closes #248.
• Upgrade to trampoline based Amalgamate. Closes #247.
• Upgrade amalgamate to 0.1.36. Closes #246.
• Upgrade riffle to 2.0.0-alpha.40. Closes #245.
• Upgrade destructible to 7.0.0-alpha.14. Closes #244.
• Upgrade b-tree to 2.0.0-alpha.63. Closes #243.
• Remove dead code. Closes #242.
• Tidy whitespace.
• Remove dead code.
• Upgrade amalgamate to 0.1.10. Closes #241.
• Upgrade riffle to 2.0.0-alpha.14. Closes #240.
• Upgrade amalgamate to 0.1.8. See #234.
• Upgrade amalgamate to 0.1.7. See #234.
• Upgrade amalgamate to 0.1.6. Closes #239.
• Extract staged tree to its own module. See #234.
• Prepare to extract MVCC logic to separate class. See #234.
• Only two stages at a time. See #234.
• Upgrade to get-less Strata. See #234.
• Big batch insert, sort out shutdown. See #234.
• Test coverage of default options. See #234.
• Implement batch and amalgamate while running. See #234.
• Unit test _del. See #234.
• Get not as buffer. See #234.
• Remove temporary files accidentally checked in. See #236.
• Relocate unit test. See #234.
• Remove old t directory. Closes #236.
• Unit test get not found. See #234.
• Unit test an iterator. See #234.
• Move callbackify to Prospective. See #234.
• Remove dead code. See #234.
• Reopen a Locket database, amalgamate on open. See #234.
• Add chicklets and links to README.md. See #236.
• Build with Actions, ship coverage to Codecov. Closes #237. Closes #238.
• Update .gitignore. See #236.
• Remove tmp directory what got checked in. See #236.
• Add .npmignore. See #236.
• Update LICENSE for 2020. Closes #235.
• Minimal working ES6 conversion. See #234.
• Udate LICENSE for 2018.
• Use shorthand GitHub URL.
• Build with Node.js 8 on Travis CI.ush
• Do not build with Node.js 7 on Travis CI.
• Upgrade proof to 3.0.x.
• Upgrade delta to 1.2.x.
• Upgrade arguable to 5.2.x.
• Do build with Node.js 7 on Travis CI.
• Do not build with Node.js 5 on Travis CI.
• Upgrade arguable to 5.0.x.
• Upgrade abstract-leveldown to 2.6.x.
• Update LICENSE for 2017.
• Upgrade Arguable to 4.3.x.
• Uprade Proof to 1.2.x.
• Upgrade to Proof Redux.
• Tidy package.json.
• Remove .imdone.
• Remove Timezone, use toISOString().
• Upgrade Timezone to 1.0.x.
• Upgrade Vestibule to 1.3.x.
• Upgrade Reactor to 2.2.x.
• Upgrade rimraf to 2.5.4.
• Upgrade tap to 6.3.0.
• Upgrade levelup to 1.3.2.
• Upgrade Delta to 1.1.x.
• Upgrade Arguable to 3.1.x.
• Upgrade Arguable to 3.0.x.
• Pin dependencies to minor version.
• Upgrade leveldown to 1.4.6.
• Upgrade abstract-leveldown to 2.6.0.
• Build with latest Node.js 6 on Travis CI.
• Indent package.json.

Closes #258.