MAINT: Update NEP-30#14257

Merged

rgommers merged 3 commits intonumpy:masterfrom

pentschev:update-nep30

Sep 7, 2019

Commits on Aug 12, 2019

Update NEP-30 with scope and usage example
pentschev
committed

Commits on Aug 13, 2019

Update NEP-30 with usage guidance and stack example
pentschev
committed

Commits on Aug 14, 2019

Fix NEP-30 usage example
pentschev
committed