chore(deps): update stable ember infrastructure

Author: renovate-bot

package.json

@@ -83,7 +83,7 @@
     "co": "4.6.0",
     "commitlint-azure-pipelines-cli": "1.0.3",
     "conventional-changelog-cli": "2.0.31",
-    "ember-cli": "3.14.0",
+    "ember-cli": "3.15.1",
     "ember-cli-addon-docs": "ember-learn/ember-cli-addon-docs#4f5bfd11",
     "ember-cli-addon-docs-esdoc": "0.2.3",
     "ember-cli-app-version": "3.2.0",
@@ -107,7 +107,7 @@
     "ember-maybe-import-regenerator": "0.1.6",
     "ember-qunit": "4.6.0",
     "ember-resolver": "6.0.2",
-    "ember-source": "3.15.0",
+    "ember-source": "3.16.0",
     "ember-try": "1.4.0",
     "eslint": "6.8.0",
     "eslint-config-prettier": "6.9.0",