It seems like your package is claiming the wrong license: The original nose implementation is subject to LGPL-2.1-only as far as I can see (https://github.com/nose-devs/nose/blob/master/lgpl.txt), but you are distributing your version as MIT.

Apparently, you reuse most of the original code in your fork and thus are forced to make your version available as LGPL-2.1-only as well (see §2 of the LPGL-2.1 license text, especially §2c). (In theory, §3 allows you to choose GPL-2.0 or any later GPL version as well, but this would mean an even stronger copyleft variant.)