v2 release notes

• typescript
• most of the tests stay untouched
• supported node version: 8
• appveyor: install is okay, tests are not
• package.json has a module (ES6) and types
• awesome circular-json
• all tests are executed against all mocha versions
• which CLI options are supported? page
• new test: --delay
• new test: --retries
• many tests which check reporter output: new level
• many tests which check reporter output with JSON: +N levels for each of N files
• all tests with --retry option removed
• API:.default
• selenium-webdriver is not flaky anymore