#Functional Vec
Owning versions of all mutable vec methods. Makes vecs slightly more
ergonomic to use in folds.
Supports `no_std` environments using the `alloc` crate directly.
##Example
```rust
use functional_vec::FunctionalVec;
let v = (0..10).fold(Vec::new(), |acc, curr| acc.push_new(curr));
assert_eq!(v, vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
```