Hashtag

A parser for finding hashtags in strings. For example parsing Rust is #awesome gives you awesome and its location within the string.

Sample usage

```rust extern crate hashtag;

use hashtag::Hashtag;

pub fn main() { let tags: Vec = Hashtag::parse("#rust is #awesome"); println!("{:?}", tags); // => [Hashtag { text: "rust", start: 0, end: 4 }, Hashtag { text: "awesome", start: 9, end: 16 }] } ```