chore(package): update ember-cli-dependency-checker to version 3.1.0

Closes #81

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "ember-cli-babel": "^6.6.0",
     "ember-cli-chai": "^0.4.2",
     "ember-cli-code-coverage": "^0.4.0",
-    "ember-cli-dependency-checker": "^2.0.0",
+    "ember-cli-dependency-checker": "^3.1.0",
     "ember-cli-eslint": "^4.1.0",
     "ember-cli-htmlbars": "^2.0.2",
     "ember-cli-htmlbars-inline-precompile": "^1.0.0",