add header to changelog file #105

Job	Run time
Tests	26s
Floating Dependencies	36s
ember-lts-3.12	44s
ember-lts-3.16	48s
ember-lts-3.20	30s
ember-lts-3.24	40s
ember-lts-3.28	30s
ember-lts-4.4	33s
ember-lts-4.8	30s
ember-release	33s
ember-beta	35s
ember-canary	31s
ember-classic	44s
embroider-safe	31s
embroider-optimized	40s
no-deprecations	36s
ember-release-no-deprecations	49s
	10m 16s

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