Sample `.env` file:
```
a = hi
b = -123
c = false
```
```rust
use dotconf::{init, init_with_path};
init().expect("Failed to load env conf file (default: .env)");
init_with_path(".dotenvfile").expect("Failed to load from the specified env conf file");
let a = dotconf::var("a").to_string().unwrap();
let b = dotconf::var("b").to_isize().unwrap();
let c = dotconf::var("c").to_bool().unwrap();
```