envvar 0.1.2

This tiny crate provides the `var()` function which is the same as `std::env::var()` but the `NotPresent` variant of `VarError` provides the name of the missing environment variable
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This tiny crate provides the `var()` function which is the same as [`std::env::var`](https://doc.rust-lang.org/stable/std/env/fn.var.html) but the `NotPresent` variant of `VarError` provides the name of the missing environment variable:

```
pub enum VarError {
    NotPresent(String),
    NotUnicode(OsString),
}
```