Big changes

• Chromium 83.0.4103.0 (r756035)
• New API to get SAN added to SecurityDetails (SecurityDetails.subjectAlternativeNames())

Raw notes

8ba3675 - chore: mark version v3.1.0 (#5883)
a17bd89 - feat: add securityDetails.subjectAlternativeNames() #5628 (#5881)
e823289 - feat(chromium): roll Chromium to r756035 (#5879)
ad3613d - docs(contributing): clarify list of Chromium versions (#5878)
dc26b8d - docs(examples): add cucumber-puppeteer-example for integration testing (#5875)
3e76554 - chore: fix async dialog specs when they fail (#5859)
b2552e4 - chore: restore page.setUserAgent test (#5868)
39f1b13 - chore: extract Request and Response into its own module (#5861)
b510c35 - chore: fetch Firefox from JSON source instead of RegExp (#5864)
69c38fc - chore: extract ConsoleMessage and FileChooser into its own module (#5856)
0aba6df - chore: force Mocha to exit on CI (#5862)
9368edb - chore: upgrade TypeScript to 3.9 (#5860)
5f42547 - chore: extract SecurityDetails into its own module (#5858)
f5d2597 - chore: add running TSC to test README (#5852)
c6d01c9 - chore: extract BrowserRunner into its own module (#5850)
b38bb43 - Warn when given unsupported product name. (#5845)
6099272 - chore: add @types/proxy-from-env (#5831)
5343c7a - chore: private-ise src/Accessibility.ts (#5832)
ce09742 - feat: add more options to check_availability script (#5827)
5103540 - chore: add command to run eslint with --fix flag (#5829)
49ce659 - chore: remove src/TaskQueue (#5826)
4fdb1e3 - chore: add Prettier (#5825)
ae576af - chore: mark v3.0.4-post (#5824)