Upgrade rls-{data,span}

[ishitatsuyuki]

Additionally, lock racer version. The upstream started to fuck up interface.

Cargo has bumped the version and broke the compatibility. The code is updated accordingly (untested, hope it works).

We should really pin things to crates.io, with exception of rls related crates.

[nrc]

Thanks for the PR! The Racer version lock looks good, but we should not bump the other deps - there is a bit of an ongoing experiment there and we're not ready to use the newer versions in the RLS just yet.

[ishitatsuyuki]

I have confirmed that the build passes and it should work as long as the modules are following semver.

[nrc]

Thanks for checking, but I would still rather not bump the versions until we know that is the direction we want to go in. There is also test failure here which may or may not be related.

[ishitatsuyuki]

I'm going to close this as the new RLS crates needs porting. Instead, I will open another PR which simply upgrades (propers) dependencies, after rust-dev-tools/rls-vfs#15 is resolved.