Merge pull request #6 from miherlosev/master

update testcafe up to 0.18.0

Author: miherlosev

package.json

@@ -53,7 +53,7 @@
     "publish-please": "^2.2.0",
     "rxjs": "^5.4.3",
     "systemjs": "0.19.39",
-    "testcafe": "dev",
+    "testcafe": "^0.18.0",
     "typescript": "^2.5.2",
     "zone.js": "^0.8.4"
   },