npm audit issue

```
# npm audit report

merge  <2.1.1
Severity: high
Prototype Pollution - https://npmjs.com/advisories/1666
No fix available
node_modules/merge
  mkapi  *
  Depends on vulnerable versions of merge
  node_modules/mkapi
    mkdoc  *
    Depends on vulnerable versions of mkapi
    node_modules/mkdoc

3 high severity vulnerabilities
```