Museval

* Update to newest version of musdb
* Switch from travis to gh actions

Bug Fixes

* Removes deprecation warning (72 thanks to lminer)

This new release of museval makes the package compatible to musdb 0.3.0.

New Features

* introducing pandas based `TrackStore`, `EvalStore` and `MethodStore` to aggregate and evaluate the results along multiple tracks

Breaking changes

* python 2.x support is dropped

Thanks to

hagenw carlthome TE-StefanUhlich keunwoochoi Chadys bmcfee, davda54

musdb 0.3.0 will break compatiblitity with museval <0.3.0. Therefore this release makes sure that 0.2.x users will use the 0.2.3 release from musdb.

This is a a beta release, please to use it for now