About the dotenv crate

So, I'm still quite new to Rust and have started a little hobby project to get a feel on it.After some practice with frontend, I'll start doing some backend stuff too. Now something that I've found to be interesting is that Diesel, that's a big ORM for Rust, is recommending this crate called dotenv that was last updated 2 years ago and says it's a v0.

Achtung! This is a v0.\* version! Expect bugs and issues all around. Submitting pull requests and issues is highly encouraged!

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Crates.io shows that this crate's been downloaded over 6 million times and is very popular. Isn't that a concern? Some people are probably using it without knowing about its security.

What package do you guys use to deal with environment variables?