CI/CD

Bump ember-cli-clean-css from 2.0.0 to 3.0.0 #1712

Job	Run time
Lint files	1m 8s
Test addon (floating dependencies) (ember)	2m 25s
Test addon (floating dependencies) (node)	1m 35s
Test addon (floating dependencies) (test-apps)	4m 34s
Test addon (locked dependencies) (ember)	2m 4s
Test addon (locked dependencies) (node)	1m 4s
Test addon (locked dependencies) (test-apps)	1m 38s
Test compatibility (ember-lts-4.4)	2m 59s
Test compatibility (ember-lts-4.8)	3m 8s
Test compatibility (ember-release)	3m 6s
Test compatibility (ember-beta)	4m 0s
Test compatibility (ember-canary)	3m 12s
Test compatibility (embroider-safe)	4m 28s
Deploy app	0s
	35m 21s

Provide feedback