Merge branch 'paritytech:master' into master #36

Job	Run time
Check (ubuntu-latest, stable, clang)	41s
Check (ubuntu-latest, stable, gcc)	46s
Check (ubuntu-latest, nightly, clang)	55s
Check (ubuntu-latest, nightly, gcc)	45s
Check (macos-latest, stable, clang)	1m 26s
Check (macos-latest, stable, gcc)	1m 9s
Check (macos-latest, nightly, clang)	1m 24s
Check (macos-latest, nightly, gcc)	1m 20s
Test (ubuntu-latest, stable, clang)	1m 43s
Test (ubuntu-latest, stable, gcc)	1m 49s
Test (ubuntu-latest, nightly, clang)	1m 42s
Test (ubuntu-latest, nightly, gcc)	1m 43s
Test (macos-latest, stable, clang)	2m 29s
Test (macos-latest, stable, gcc)	2m 5s
Test (macos-latest, nightly, clang)	3m 43s
Test (macos-latest, nightly, gcc)	2m 16s
Build (ubuntu-latest, stable, clang)	1m 20s
Build (ubuntu-latest, stable, gcc)	1m 39s
Build (ubuntu-latest, nightly, clang)	1m 25s
Build (ubuntu-latest, nightly, gcc)	1m 26s
Build (macos-latest, stable, clang)	2m 12s
Build (macos-latest, stable, gcc)	3m 45s
Build (macos-latest, nightly, clang)	3m 30s
Build (macos-latest, nightly, gcc)	3m 7s
	44m 20s

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