Smelli

This new release adds 8 observables to the global likelihood and increases the computing speed. It corresponds to the numerics used in v2 of [arXiv:1810.07698](https://arxiv.org/abs/1810.07698).

New observables

- τ^-→e^-μ⁺μ^-, τ^-→μ^-e⁺μ^-, τ^-→e^-μ⁺e^-
- K_L→ee, K_L→μμ, K_S→ee, K_S→μμ, K_L→eμ

Other improvements

- Now based on [flavio v1.2](https://github.com/flav-io/flavio/releases/tag/v1.2), smelli profits from improvements e.g. to the B→D^(*) form factors.
- Thanks to improvements in [wilson v1.5](https://github.com/wilson-eft/wilson/releases/tag/v1.5), the EFT operations (basis translation and matching) are now significantly faster, leading to a reduced computing time per parameter point.

This is the first public smelli release, corresponding to the version used for v1 of [arXiv:1810.07698](https://arxiv.org/abs/1810.07698).