Minimum Supported Rust Version?

[rillian]

Thanks for taking over maintaining dotenvy! It was great to have an alternative when cargo audit started warning about the old crate being unmaintained.

Unfortunately today's 0.15.4 release broke our application, which is building on rust 1.58.1. I see you're only testing on stable, beta, and nightly; would you consider supporting older toolchains as well?

Many crates declare a minimum supported rust version (MSRV) so downstream users have some guidance toward the impact on their support surface.

[allan2]

You read my mind!

Thanks for the PR. v0.15.5 published