1.4.0: Reporting

• Merged PR #21: Add JSON report, producing test reports in JSON format
  compatible with Mocha, see https://mochajs.org/#json. This can be used
  to integrate with https://github.com/marketplace/actions/test-reporter,
  see https://github.com/xp-framework/test/actions/runs/4777443690 at the
  very bottom of the page.
  (@thekid)
• Merged PR #20: Extract output into a dedicated classes, reports.
  • The command line option -r select report to use
  • The default report is called Grouped
  • A minimalistic report called Dots prints a . for each test
  • Multiple reports can be used
  • Report arguments can be passed via -r [Report],[Arg1],[Arg2]
    (@thekid)