chore(package): update ember-test-selectors to version 2.1.0

Closes #78

Author: greenkeeper[bot]

package.json

@@ -57,7 +57,7 @@
     "ember-simple-auth": "^1.2.1",
     "ember-sinon": "^0.7.0",
     "ember-source": "~2.15.0",
-    "ember-test-selectors": "^0.3.0",
+    "ember-test-selectors": "^2.1.0",
     "ember-truth-helpers": "^1.3.0",
     "eslint-plugin-ember-suave": "1.0.0",
     "jquery-deparam": "^0.5.3",