Bump chisel3 from `b7d116ce` to `71c0a2e7` (#136)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `b7d116ce` to `71c0a2e7`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/b7d116cea4f5deb5c5835b7672e9ac39cad14af1...71c0a2e7fe74b198ae94ba31b1445317c4b23389

)

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