fix: upgrade opener from 1.5.1 to 1.5.2 (#465)

Snyk has created this PR to upgrade opener from 1.5.1 to 1.5.2.

See this package in npm:
https://www.npmjs.com/package/opener

See this project in Snyk:
https://app.snyk.io/org/nodeshift-agg/project/0569fa2f-39b2-4a6a-9bdc-8ac878d28a88?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -54,7 +54,7 @@
     "coveralls": "^3.1.0",
     "documentation": "^13.0.2",
     "nyc": "~15.1.0",
-    "opener": "1.5.1",
+    "opener": "1.5.2",
     "serve": "^11.3.2",
     "standard-version": "9.0.0",
     "standardx": "^5.0.0",