Bump broccoli-asset-rev from 2.5.0 to 2.6.0
Bump broccoli-asset-rev from 2.5.0 to 2.6.0

Bumps [broccoli-asset-rev](https://github.com/rickharrison/broccoli-asset-rev) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/rickharrison/broccoli-asset-rev/releases)
- [Commits](https://github.com/rickharrison/broccoli-asset-rev/commits/v2.6.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
rwjblue/ember-lifeline,rwjblue/ember-lifeline