Update fetch() browser support in docs (#2522)
Update fetch() browser support in docs (#2522)

* Update fetch() browser support in docs

As https://caniuse.com/#feat=fetch shows it's supported since Safari 10.1.

* Update docs/request.md

Co-Authored-By: Isiah Meadows <1a73af9e7ae00182733b2292511b814be66f065f@isiahmeadows.com>

[skip ci]

impinball/mithril.js,lhorie/mithril.js,barneycarroll/mithril.js,impinball/mithril.js,MithrilJS/mithril.js,barneycarroll/mithril.js,pygy/mithril.js,MithrilJS/mithril.js,lhorie/mithril.js,pygy/mithril.js