gsl-lite v1.0.1

Fixes

• Add span<> constructor overloads for span<>::iterator arguments. (fec81ab6c4f10b99e3034c8926422fb39c5272ad)
  This improves backward compatibility, since our iterator used to be a pointer in v0.*, which made span{ otherSpan.begin(), 0 } work because we have constructor overloads that accept pointers.
• Add missing alias templates for polyfills. (62afbe95ae5b857d4c2802b5167264b79373a4ef)

Full Changelog: https://github.com/gsl-lite/gsl-lite/compare/v1.0.0...v1.0.1