Bump to 0.5.0

Update deps in Cargo.toml

Bump durian_proc_macros to 0.2.0

Bump durian_macros to 0.4.0

Bump durian to 0.4.0

Update dependencies

Update readmes

Update env_logger dev dependency to version constraint instead of

wildcard due to crates.io blocking wildcards

Bump to 0.2.0

update readme and docs