Release ink! 3.0.0-rc7 (use-ink#1043)

* Bump `3.0.0-rc6` ➔ `3.0.0-rc7`

* Update release notes

* Update release notes

* Remove outdated changelog note

Limit `ink_eth_compatibility` crate keywords to five (use-ink#966)

Otherwise crates.io refrains from publishing:

	invalid upload request: invalid length 6, expected at most 5 keywords per crate

Release ink! 3.0.0-rc5 (use-ink#909)

* Bump version to rc5

* Add release notes

Release ink! 3.0.0-rc4 (use-ink#864)

* Add `Fixed` entry for use-ink#842

* Replace `3.0.0-rc3` with `3.0.0-rc4`

* Add bump allocator to release notes

ink! 3.0.0-rc3 release

ink! 3.0.0-rc2 release

ink! 3.0-rc1 release

v2.1.0 release

current latest v2.x.y ink! release

v2.0.0 release