Remove nonstandard ISCL short id from ISC license

[waldyrious]

Request to add a new Trove classifier (or more exactly, to update an existing one).

The name of the classifier(s) you would like to add:

• License :: OSI Approved :: ISC License

Why do you want to add this classifier?

The canonical short identifier for the ISC License is simply ISC; see https://spdx.org/licenses/ISC.html. This change aligns the ISC License classifier to match similar ones such as MIT License, BSD License, etc.

[di]

I think any change to the current license classifiers is blocked on https://github.com/pypa/trove-classifiers/issues/17 (or the implementation of a SPDX license classifier field).

[waldyrious]

Thanks for the pointer — I'll keep track of that discussion.