[CHANGELOG] Release v0.6.0

[CHANGELOG] Release v0.5.0

Merge branch 'release' into main

Merge branch 'xpulp-dev-matheusd' into 'master'

XPulpIMG MAC and SIMD instructions

See merge request mempool/mempool!78

Merge branch 'cache' into 'master'

Improve the instruction cache

See merge request mempool/mempool!76

Merge branch 'release' into 'master'

🎉 Initial release

See merge request mempool/mempool!70