chore(deps-dev): bump @ember/string from 3.0.1 to 3.1.1 #137

Job	Run time
Lint	1m 4s
Floating Dependencies (ubuntu-latest, chrome)	48s
Tests (ubuntu-latest, chrome)	49s
Tests - ember-lts-3.28	1m 8s
Tests - ember-lts-4.4	1m 1s
Tests - ember-lts-4.8	1m 2s
Tests - ember-classic	1m 8s
Tests - ember-release	1m 5s
Tests - ember-beta	59s
Tests - embroider-safe	1m 8s
Tests - embroider-optimized	1m 46s
Tests - ember-canary	53s
	12m 51s

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