Merge pull request #491 from ember-learn/drop-old-ember #333

Job	Run time
Floating Dependencies	1m 55s
Percy Tests	3m 16s
Tests	4m 7s
ember-lts-3.28	3m 13s
ember-release	4m 43s
ember-canary - Allowed to fail	3m 22s
ember-beta	3m 15s
ember-release-no-deprecations - Allowed to fail	3m 5s
ember-classic	3m 0s
ember-default-with-jquery	4m 35s
embroider-safe	3m 54s
embroider-optimized	4m 49s
no-deprecations	3m 58s
	47m 12s

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