Bump chisel3 from `efd47484` to `b187a0ce` (#284)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `efd47484` to `b187a0ce`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/efd474842738444a030fbe7702d58d4a249d6ebc...b187a0ce5269e735e7bd75620b4fd33f7ed27af5

)

---
updated-dependencies:
- dependency-name: chisel3
  dependency-type: direct:production
...

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