After the usual 6-month development period, GNOME 3.20 was released today and it includes changes such as updated Software app, which can now handle operating system upgrades, image editing capabilities for the Photos app, a new shortcuts window which displays the available keyboard shortcuts in most GNOME apps, and more.
Source: GNOME 3.20 Released With Various Refinements And Application Updates ~ Web Upd8: Ubuntu / Linux blog