Function parse_footers 

pub fn parse_footers(footers: &str) -> Result<Vec<Footer>, ParseError>

Parse commit footers only

Example :

use conventional_commit_parser::parse_footers;
use conventional_commit_parser::commit::*;

let footer = r#"a-token: this is a token
another-token #this is a token with hash separator"#;

let parsed = parse_footers(footer).expect("Parse error");

assert_eq!(parsed, vec![
    Footer {
        token: "a-token".to_string(),
        content: "this is a token".to_string(),
        token_separator: Separator::Colon
    },
    Footer {
        token: "another-token".to_string(),
        content: "this is a token with hash separator".to_string(),
        token_separator: Separator::Hash
    }
]);