version 0.5.0

set version to 0.5.0

revise warning messages

cleanup + clippy

fix tarpaulin tests: use Parser::try_parse_from

clippy fixes

version 0.4.0 + added CHANGELOG.md

updated Cargo.toml

derived more traits (based on API guidelines list)

note: SomeVec's traits were not changed; can be (more carefully) considered later (implementing Default breaks non-empty guarantee)

added readme paragraph about hashdeep log warnings