v3.0.0

• prevent listener leak through abort controller. #6 a0e0baa
• refactor 20b9374
• strict assert 9957018
• style d0451d3
• travis -> github actions 4695a80
• docs 14da70c
• switch to test module 7c4ad05
• use standard code style f159d11
• convert to esm module dc4e156

v2.0.0...v3.0.0