chore: Release simdutf8 version 0.1.5

(cargo-release) simdutf8 version 0.1.4

Merge branch 'main' of github.com:rusticstuff/simdutf8

bump version

Merge pull request #24 from rusticstuff/v.next

Prepare v0.1.1

bump to 0.1.0

bump versions

benchmarks are TBD