Release 1.0.3

Security fixes

• Upgrade git2 dependency to 0.18.2 to fix security vulnerabilities in libgit2, including in revision parsing. These do not appear to affect git-status-vars.

API breaking changes

• Switched Reference::new() and friends to accept types that implement std::fmt::Display instead of AsRef<str>. The functions convert the parameters to owned Strings with to_string() anyway, so this more accurately reflects what the functions are doing.

Other API changes

• ShellWriter::with_prefix() now accepts anything that implements std::fmt::Display as the prefix rather than just Strings.