is-dev-rs

A simple macro to determine if an environment is a "development" environment.

Built because some of us (me) are lazy and don't feel like copy-pasting the same check for development environments over and over again.

:heart:

Ex: ```rust

[macrouse] extern crate isdev;

fn testisdev() { let e: bool = is_dev!("ENV", "development"); assert!(e); } ```