CI/CD

Bump ember-cli-clean-css from 2.0.0 to 3.0.0 (#1486) #1759

Job	Run time
Test addon (floating dependencies) (ember)	1m 38s
Test compatibility (ember-lts-4.4)	2m 30s
Test addon (floating dependencies) (node)	1m 25s
Lint files	49s
Test addon (locked dependencies) (ember)	1m 17s
Test compatibility (ember-lts-4.8)	2m 29s
Test addon (floating dependencies) (test-apps)	1m 39s
Test addon (locked dependencies) (node)	50s
Test compatibility (ember-lts-5.4)	2m 37s
Test addon (locked dependencies) (test-apps)	1m 7s
Test compatibility (ember-release)	2m 30s
Test compatibility (ember-beta)	2m 27s
Test compatibility (ember-canary)	3m 0s
Test compatibility (embroider-safe)	2m 46s
Deploy app	26s
	27m 30s

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