Bump node-red-node-test-helper from 0.1.8 to 0.3.6

Bumps [node-red-node-test-helper](https://github.com/node-red/node-red-node-test-helper) from 0.1.8 to 0.3.6.
- [Release notes](https://github.com/node-red/node-red-node-test-helper/releases)
- [Changelog](https://github.com/node-red/node-red-node-test-helper/blob/master/CHANGELOG.md)
- [Commits](https://github.com/node-red/node-red-node-test-helper/commits/0.3.6)

---
updated-dependencies:
- dependency-name: node-red-node-test-helper
  dependency-version: 0.3.6
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -12,7 +12,7 @@
     "coveralls": "^3.0.2",
     "mocha": "~5.2.0",
     "node-red": "~0.19.5",
-    "node-red-node-test-helper": "~0.1.8",
+    "node-red-node-test-helper": "~0.3.6",
     "nyc": "^13.1.0"
   },
   "keywords": [