vlog 0.1.2

Macros to do stdout / stderr logs based on verbosity level.
Documentation 
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# vlog-rs

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[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)

Macros to do stdout / stderr logs based on verbosity level, which take in the
same arguments as
[`println!`](https://doc.rust-lang.org/1.0.0/std/macro.println!.html) macro.

Useful for CLI applications. The default verbosity level is 0, and the supported
max verbosity level is 3, which is equivalent to `-vvv` flags as seen in most
Linux CLI applications.

## Example

```rust
#[macro_use]
extern crate vlog;

use vlog::{get_verbosity_level, set_verbosity_level};

fn main() {
    // default verbosity level is 0
    assert_eq!(0, get_verbosity_level());
    v0!("v0 prints");
    v1!("v1 won't print");
    v2!("v2 won't print");
    v3!("v3 won't print");

    // set custom verbosity level
    set_verbosity_level(1);
    assert_eq!(1, get_verbosity_level());
    v0!("{} prints", "v0");
    v1!("{} prints", "v1");
    v2!("{} won't print", "v2");
    v3!("{} won't print", "v3");

    // set custom max verbosity level
    set_verbosity_level(3);
    assert_eq!(3, get_verbosity_level());
    v0!("{} prints", "v0");
    v1!("{} prints", "v1");
    v2!("{} prints", "v2");
    v3!("{} prints", "v3");
}
```