Adjust dependency to support termcolor 1.2 #105

Job	Run time	Billable time
check	29s	0s
format	21s	0s
check-minimal	22s	0s
doc	26s	0s
test (stable, --no-default-features)	28s	0s
test (stable, --no-default-features --features "test")	35s	0s
test (stable, --no-default-features --features "termcolor")	31s	0s
test (stable)	29s	0s
test (stable, --all-features)	34s	0s
test (beta, --no-default-features)	23s	0s
test (beta, --no-default-features --features "test")	24s	0s
test (beta, --no-default-features --features "termcolor")	31s	0s
test (beta)	23s	0s
test (beta, --all-features)	30s	0s
test (nightly, --no-default-features)	31s	0s
test (nightly, --no-default-features --features "test")	27s	0s
test (nightly, --no-default-features --features "termcolor")	28s	0s
test (nightly)	26s	0s
test (nightly, --all-features)	35s	0s
tarpaulin	17s	0s
publish	0s	0s
	9m 10s	0s

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