Update to latest master Rocket version (#89) #75

Job	Run time
ci (stable, ubuntu-latest, --all-features)	44s
ci (stable, ubuntu-latest, --no-default-features)	44s
ci (stable, windows-latest, --all-features)	1m 45s
ci (stable, windows-latest, --no-default-features)	2m 14s
ci (stable, macOS-latest, --all-features)	2m 10s
ci (stable, macOS-latest, --no-default-features)	1m 6s
ci (nightly, ubuntu-latest, --all-features)	45s
ci (nightly, ubuntu-latest, --no-default-features)	43s
ci (nightly, windows-latest, --all-features)	1m 32s
ci (nightly, windows-latest, --no-default-features)	2m 8s
ci (nightly, macOS-latest, --all-features)	1m 14s
ci (nightly, macOS-latest, --no-default-features)	1m 30s
	16m 35s

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