README example no longer compiles

[workingjubilee]

error[E0107]: struct takes 1 generic argument but 2 generic arguments were supplied
   --> src/main.rs:5:16
    |
5   |     let mut v: SmallVec<i32, 4> = smallvec![1, 2, 3, 4];
    |                ^^^^^^^^      - help: remove this generic argument
    |                |
    |                expected 1 generic argument
    |
note: struct defined here, with 1 generic parameter: `A`
   --> /playground/.cargo/registry/src/index.crates.io-6f17d22bba15001f/smallvec-1.13.1/src/lib.rs:768:12
    |
768 | pub struct SmallVec<A: Array> {
    |            ^^^^^^^^ -

[workingjubilee]

Oh, I got confused by the v1 vs. v2 branch thing. darnit.