Publish a version with the `sincosf` fix

We are eager to use a version of libm with the `sincosf` fix from #229 in [euclid](https://github.com/servo/euclid).

It would be great to get the fix published on crates.io. Either `0.2.0` which is what master has in Cargo.toml, or if the `0.2.0` is pending on upcoming work in progress, creating a `0.1.5` branch on top of `0.1.4` with a backport of the fix would work just as well.