Upgrade browser support matrix

[daun]

Description

• Upgrade list of supported browser versions
• Clarify wording that this is valid for the UMD/CDN build
• Add note about transpiling and polyfills
• Add note about downgrading to v3 for IE11 support

Checks

• [x] The PR is submitted to the master branch
• [x] The code was linted before pushing (npm run lint)
• [x] All tests are passing (npm run test)
• [ ] New or updated tests are included
• [x] The documentation was updated as required

Additional information

Related to discussion #871

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