chore(deps): bump nconf from 0.10.0 to 0.12.0

Bumps [nconf](https://github.com/flatiron/nconf) from 0.10.0 to 0.12.0.
- [Release notes](https://github.com/flatiron/nconf/releases)
- [Changelog](https://github.com/indexzero/nconf/blob/master/CHANGELOG.md)
- [Commits](indexzero/nconf@0.10.0...v0.12.0)

---
updated-dependencies:
- dependency-name: nconf
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>