Move react-addons-test-utils to devDeps

Author: Patrick Burtchaell

package.json

@@ -66,6 +66,7 @@
     "mocha": "^3.2.0",
     "pre-commit": "^1.2.2",
     "react": "^15.5.4",
+    "react-addons-test-utils": "^15.5.1",
     "react-dom": "^15.5.4",
     "react-test-renderer": "^15.5.4",
     "sinon": "^1.17.3",
@@ -74,7 +75,6 @@
     "webpack-dev-server": "^1.14.1"
   },
   "dependencies": {
-    "prop-types": "^15.5.8",
-    "react-addons-test-utils": "^15.5.1"
+    "prop-types": "^15.5.8"
   }
 }