fix ember-source peer declaration #774

Job	Run time
Legacy Mocha Tests - 16.x	22s
Ember Tests (16.x, ubuntu-latest)	49s
Legacy Mocha Tests - 14.x	27s
discover_matrix	22s
lint-all-packages	32s
Ember Tests (16.x, windows-latest)	2m 49s
Ember Tests (14.x, ubuntu-latest)	1m 9s
Ember Tests (14.x, windows-latest)	2m 36s
Test Packages (16.x, ubuntu-latest)	1m 18s
Test Packages (16.x, windows-latest)	3m 56s
ember-try for ember-cli-fastboot: ember-lts-3.16	43s
Test Packages (14.x, ubuntu-latest)	1m 23s
ember-try for ember-cli-fastboot: ember-lts-3.20	44s
Test Packages (14.x, windows-latest)	3m 12s
ember-try for ember-cli-fastboot: ember-lts-3.24	48s
ember-try for ember-cli-fastboot: ember-lts-3.28	54s
ember-try for ember-cli-fastboot: ember-lts-4.4	54s
ember-try for ember-cli-fastboot: ember-lts-4.8	47s
ember-try for ember-cli-fastboot: ember-lts-4.12	50s
ember-try for ember-cli-fastboot: ember-lts-5.4	49s
ember-try for ember-cli-fastboot: ember-release	56s
ember-try for ember-cli-fastboot: ember-beta	56s
ember-try for ember-cli-fastboot: ember-canary	43s
ember-try for ember-cli-fastboot: embroider-safe	50s
ember-try for ember-cli-fastboot: embroider-optimized	49s
ember-try for ember-cli-fastboot: no-deprecations	59s
ember-try for ember-cli-fastboot: ember-release-no-deprecations	50s
custom-output-paths	31s
ember-cli-fastboot	31s
fastboot-config-location	31s
fastboot-express-middleware	34s
fastboot-location	44s
fastboot-shoebox-test	39s
integration-tests	1m 19s
oneerror-per-visit	1m 0s
request-details	39s
root-url	31s
	38m 26s

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