Build failing on Windows

[RomanKornev]

$ npm run app

> [email protected] app C:\Python\devdocs-desktop
> DEBUG=devdocs-desktop:* electron app/index.js

'DEBUG' is not recognized as an internal or external command,
operable program or batch file.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] app: `DEBUG=devdocs-desktop:* electron app/index.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] app script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Roman\AppData\Roaming\npm-cache\_logs\2019-01-07T20_03_02_568Z-debug.log

Switching to env DEBUG=devdocs-desktop:* electron app/index.js fixes it for Windows.