variantly 0.1.0

Derive associated functions for enum variants that are familiar from `std::option::Option` & `std::result::Result` such as `unwrap_or` or `and_then`.
Documentation 
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mod helper;
use helper::{
    TestEnum,
    TestEnum::{Int, Unit},
};

#[test]
fn single_value_tuple() {
    assert_eq!(Int(123).expect_int("This should have been an int"), 123);
}

#[test]
#[should_panic(expected = "This should have been an int")]
fn single_value_tuple_panic() {
    Unit.expect_int("This should have been an int");
}

#[test]
fn multi_value_tuple() {
    assert_eq!(
        TestEnum::tuple(123).expect_tuple("This should have been a tuple"),
        ("123".into(), 123)
    );
}

#[test]
#[should_panic(expected = "This should have been a tuple")]
fn multi_value_tuple_panic() {
    Unit.expect_tuple("This should have been a tuple");
}