Merge pull request #132 from danielparks/fix-doc-warnings #101

Job	Run time	Billable time
check-minimal	23s	0s
check	22s	0s
format	10s	0s
doc	29s	0s
test (stable, --no-default-features)	29s	0s
test (stable, --no-default-features --features "test")	32s	0s
test (stable, --no-default-features --features "termcolor")	26s	0s
test (stable)	39s	0s
test (stable, --all-features)	34s	0s
test (beta, --no-default-features)	30s	0s
test (beta, --no-default-features --features "test")	24s	0s
test (beta, --no-default-features --features "termcolor")	31s	0s
test (beta)	27s	0s
test (beta, --all-features)	24s	0s
test (nightly, --no-default-features)	23s	0s
test (nightly, --no-default-features --features "test")	34s	0s
test (nightly, --no-default-features --features "termcolor")	25s	0s
test (nightly)	24s	0s
test (nightly, --all-features)	32s	0s
tarpaulin	9s	0s
publish	0s	0s
	8m 47s	0s

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