Bump ember-cli from 3.15.1 to 3.15.2

Bumps [ember-cli](https://github.com/ember-cli/ember-cli) from 3.15.1 to 3.15.2.
- [Release notes](https://github.com/ember-cli/ember-cli/releases)
- [Changelog](https://github.com/ember-cli/ember-cli/blob/master/CHANGELOG.md)
- [Commits](ember-cli/ember-cli@v3.15.1...v3.15.2)

Signed-off-by: dependabot-preview[bot] <[email protected]>

package.json

@@ -60,7 +60,7 @@
     "broccoli-test-helper": "^2.0.0",
     "chai": "^4.2.0",
     "co": "^4.6.0",
-    "ember-cli": "~3.15.1",
+    "ember-cli": "~3.15.2",
     "ember-cli-app-version": "^3.2.0",
     "ember-cli-babel": "^7.13.2",
     "ember-cli-dependency-checker": "^3.2.0",

yarn.lock

@@ -3788,10 +3788,10 @@ ember-cli-version-checker@^2.0.0, ember-cli-version-checker@^2.1.2:
     resolve "^1.3.3"
     semver "^5.3.0"
 
-ember-cli@~3.15.1:
-  version "3.15.1"
-  resolved "https://registry.yarnpkg.com/ember-cli/-/ember-cli-3.15.1.tgz#389604474c40f02870432659072304f192db07c5"
-  integrity sha512-KBL6ylTpYD6k0B2iHMvdgNnbKCdFnOHzruosQqTmbHpyJljVE1sLsTP8ErROH/PnbFzc1vZg1qQcf6tHRvyTrw==
+ember-cli@~3.15.2:
+  version "3.15.2"
+  resolved "https://registry.yarnpkg.com/ember-cli/-/ember-cli-3.15.2.tgz#c2a5871850da7537e0cb3cd0e7d59fd76cd3184e"
+  integrity sha512-ciuFaLokZDJfEzltH3QUxZYnQcigCzNrjyyVbeNtr3qUMICHZEzrreQjqIdmuOzmog+BOFddgAB2i/b7ewmV0Q==
   dependencies:
     "@babel/core" "^7.7.2"
     "@babel/plugin-transform-modules-amd" "^7.5.0"