Add local uis and reporters (close #1288)
Update history.md
1.21.3
Update history.md
Issue 1294 - JSON reporter missing error reason
Fix transforming errors to json in json reporter (#1295)
"maintainers" in package.json should probably be "contributors" as per package.json docs

See [docs](https://www.npmjs.org/doc/files/package.json.html).  `maintainers` is a field computed by npm itself.