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Merge pull request #718 from rust-lang/ci/msrv #814

Job	Run time
Check Format and Clippy	17s
Embedded	20s
Test (beta, ubuntu-latest, beta)	2m 7s
Test (nightly, ubuntu-latest, nightly)	2m 3s
Test (mingw, windows-latest, stable-x86_64-pc-windows-gnu)	7m 49s
Test (win32, windows-latest, stable-i686-pc-windows-msvc)	7m 14s
Test (stable, ubuntu-latest, stable)	2m 5s
Test (win64, windows-latest, stable-x86_64-pc-windows-msvc)	6m 11s
Test (macos, macos-latest, stable)	3m 48s
Feature check	20s
Check Documentation	28s
MSRV	3m 29s
Minimal versions	20s
	36m 31s