- Increased minimal rust version to 1.56.
- Added missing LICENSE-MIT,LICENSE-APACHE files. Licensing did not change.
- Added `from_vec_push` and `from_vec_insert` constructors.
- Use edition 2021.
- Impl `TryFrom` for `[T; N]` for `Vec1<T>`/`SmallVec1<T>` using const generic.