Bump version to `0.9.0`.

Bump version to `0.8.0`.

spirv-builder: also update forgotten badge.

Updated changelog

blessed tests

Changed current version to 0.5.0

Updated versions to 0.4.0

Update to 0.4.0-alpha.17

* Specified exact versioning for crates within rust-gpu
* Fixed spirv-std referring to an older version of spirv-std-macros

Updated versions to 0.4.0-alpha.16

Version bump to 0.4.0-alpha.15 (#920)