Added ember-lts-5.4 to ember-try scenarios #940

Job	Run time
Build (docs-app)	46s
Test (ember-container-query)	27s
Test compatibility (ember-lts-4.4)	56s
Lint (docs-app)	45s
Test (test-app)	47s
Test compatibility (ember-lts-4.8)	49s
Lint (ember-container-query)	50s
Test compatibility (ember-lts-4.12)	1m 0s
Lint (test-app)	27s
Test compatibility (ember-release)	48s
Test compatibility (ember-beta)	1m 5s
Test compatibility (ember-canary)	53s
Test compatibility (embroider-safe)	1m 0s
Test compatibility (embroider-optimized)	53s
Test (docs-app) (w1-h1)	40s
Test (docs-app) (w2-h1)	1m 3s
Test (docs-app) (w3-h1)	51s
Test (docs-app) (w1-h2)	49s
Test (docs-app) (w2-h2)	57s
Test (docs-app) (w3-h2)	54s
Test (docs-app) (w1-h3)	58s
Test (docs-app) (w2-h3)	57s
Test (docs-app) (w3-h3)	42s
	19m 17s

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