add ember-test-helpers-codemod

Author: Kelly Selden

manifest.json

@@ -11,6 +11,15 @@
     "nodeVersion": "4.0.0",
     "commands": ["jscodeshift -t https://rawgit.com/rwjblue/ember-qunit-codemod/master/ember-qunit-codemod.js ./tests/"]
   },
+  "ember-test-helpers-codemod": {
+    "version": "3.0.0-beta.1",
+    "projectTypes": ["app", "addon"],
+    "nodeVersion": "6.0.0",
+    "commands": [
+      "ember-test-helpers-codemod --type=integration tests/integration",
+      "ember-test-helpers-codemod --type=acceptance tests/acceptance"
+    ]
+  },
   "es5-getter-ember-codemod": {
     "version": "3.1.0-beta.1",
     "projectTypes": ["app", "addon"],