Bump node-forge from 0.9.2 to 0.10.0 in /src/currencyservice (GoogleC…

…loudPlatform#523)

Bumps [node-forge](https://github.com/digitalbazaar/forge) from 0.9.2 to 0.10.0.
- [Release notes](https://github.com/digitalbazaar/forge/releases)
- [Changelog](https://github.com/digitalbazaar/forge/blob/master/CHANGELOG.md)
- [Commits](digitalbazaar/forge@0.9.2...0.10.0)

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