xshell-venv - manage Python virtual environments in code.

xshell-env is an extension to [xshell], the swiss-army knife for writing cross-platform “bash” scripts in Rust.

Example

```rust use xshell; use xshell_venv::VirtualEnv;

let sh = xshell::Shell::new()?; let venv = VirtualEnv::new(&sh, "py3")?;

venv.run("print('Hello World!')")?; // "Hello World!" ```