Create a new release for crates.io

[ckaran]

@Amanieu can you please bump the version number and create a new release for crates.io? Now that parking_lot supports serde, I want to clean up my Cargo.toml dependencies so that they are pointing to crates.io rather than github.

[Amanieu]

@faern Does #119 currently have any breaking changes? If not then we can just release now and just pin the submodule on a later commit.

[faern]

I don't think that PR is breaking. I skimmed it now and could not see anything. I think we already merged all breaking changes.

But I also created #137 after reading through the serde PR.

[faern]

Would be good to get a new version out to crates.io. A lot of things improved since 0.7.1 already, and no one knows when this will be merged to libstd anyway. Some prominent improvements include:

• Support for new platforms: wasm, SGX, Redox, CloudABI.
• The bug around was_last_thread has been fixed.
• Making more stuff const fns on stable Rust
• Smaller locking primitives and futex based thread parker on stable Rust thanks to AtomicU8.
• ... And more...

Only thing I can of that we might possibly want to backport from #119 to master before a release is the change where SGX aborts instead of panics 🤷‍♂

[Amanieu]

I just published new versions of all 3 crates.