Bump testdouble from 3.9.1 to 3.9.2 (#180)
Bump testdouble from 3.9.1 to 3.9.2 (#180)

Bumps [testdouble](https://github.com/testdouble/testdouble.js) from 3.9.1 to 3.9.2.
- [Release notes](https://github.com/testdouble/testdouble.js/releases)
- [Changelog](https://github.com/testdouble/testdouble.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/testdouble/testdouble.js/compare/v3.9.1...v3.9.2)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
trentmwillis/ember-scatter,trentmwillis/ember-scatter,trentmwillis/ember-exam,trentmwillis/ember-exam,trentmwillis/ember-exam