Fix description according to nixpkgs format.
Reuse version number in changelog field url.
Drop creation of extra info.json file.
Do not save "electron" section of version_info.json file from original
repository.
Use SRI hash for exe file instead of hex. Make update script to convert
from hex to SRI format.
Change-Id: I2c64e3e6a062b3d631998385f7a39b4088437bcb
Yandex Music - Personal recommendations, selections for any occasion and
new music. This is repacked version of Beta of Yandex Music version for
windows desktop based on electron. The repack process is developing at
[cucumber-sp's](https://github.com/cucumber-sp/yandex-music-linux) project.
Change-Id: I517ba94ceee04cf9f1e13d7c33d5355cbcec0939
