Smelli

This release updates `smelli` to `flavio v2.5.4`.

In particular, all covariance matrices and the CKM scheme have been updated using the inputs from `flavio v2.5.4`.

New observables
- $b\to d\ell\ell$ observables used in [arXiv:2212.10497](https://arxiv.org/abs/2212.10497) (thanks to alekssmolkovic)
- $D$ meson charged current decays (thanks MJKirk)

New measurements
- $R_{K_S}$ and $R_{K^{*+}}$ measured by LHCb in 2021 (thanks nsahoo)
- $R_K$ and $R_{K^*}$ measured by LHCb in 2022
- $B_s\to\mu\mu$ combination of LHCb, ATLAS, and CMS measurement from [arXiv:2212.10497](https://arxiv.org/abs/2212.10497)

Updated measurements
- `K+->pinunu NA62 2019` updated to `K+->pinunu NA62 2021`
- `Ft(0+) Hardy/Towner 2014` updated to `Ft(0+) Hardy/Towner 2020` (thanks MJKirk)
- `PDG 2015` updated to `PDG 2022` (thanks MJKirk)
- `HFLAV rad 2018` updated to `Belle B->enu 2007` and `Belle B->munu 2020` (thanks to alekssmolkovic)

This minor release updates the Bs→φμμ angular observables to FL, S3, S4, and S7 measured recently by LHCb ([arXiv:2107.13428](https://arxiv.org/abs/2107.13428)).

This minor release adds b→sll observables with q² bins below 1 GeV². The set of all b→sll observables in this release is equal to the one used in [arXiv:2103.13370](https://arxiv.org/abs/2103.13370).

This release adds several new observables and measurements.

New observables
- The B0->K\*mumu and B+->K*mumu angular observables P3, P6, and P8
- The Bs->mumu effective lifetime
- mu-e conversion in nuclei (thanks hoodyn)
- BR(B0->ee) and BR(Bs->ee) (thanks to hoodyn)

New measurements
- The 2021 LHCb measurement of BR(Bs->mumu) combined with ATLAS and CMS data
- The Bs->mumu effective lifetime measured by LHCb in 2021 and by CMS in 2019
- The 2021 LHCb measurement of RK
- The 2021 muon g-2 measurement by the "Muon g-2" experiment
- The 2021 BR(Bs->phimumu) measurement by LHCb
- Sindrum II measurements of mu-e conversion in nuclei (thanks hoodyn)
- The LHCb B->ee measurements (thanks hoodyn)

New feature: compute the minimum of Δχ²

The new method `chi2_min` of the `GlobalLikelihood` class can be used to compute the minimum of Δχ²=-2 log likelihood for all individual likelihoods.

Updated measurements

All measurement have been updated to those included in flavio v2.2.0 (see https://github.com/flav-io/flavio/releases/tag/v2.2.0)

End of support for Python 3.5
This release requires at least Python 3.6. Python 3.5 has reached [end-of-life](https://devguide.python.org/devcycle/#end-of-life-branches) on 30 September 2020. If you are on an outdated system and cannot update Python, have a look at [conda](https://docs.conda.io/). It allows you to install the newest version of Python in a virtual environment without root privileges. Conda is also the best choice if you are on Windows.

New feature - 2D plot data
The new method `plot_data_2d` of the `GlobalLikelihood` class now allows convenient generation of plot data for *all* individual likelihoods at the same time. This new feature requires `flavio` v2.1.0.

Observables
The two CKM input observables `BR(B+->taunu)` and `DeltaM_d` have been removed from the likelihood in v2.0.0 since they are used to constrain the CKM elements. If the option `fix_ckm` is set to `True`, they are now included again in the likelihood.
Bugs fixed
- An error is now raised if an unknown likelihood is used in one of the arguments `include_likelihoods` or `exclude_likelihoods` on instantiation of `GlobalLikelihood` (thanks to MJKirk).
- The text encoding of the readme file is now specified in the setup script to avoid errors on an OS not using UTF-8 as default.