Bump version to 2.1.0 #92

Job	Run time
no_std Check	42s
Test Suite (stable, --no-default-features)	18s
Check (stable, --no-default-features)	11s
Lints (stable, --no-default-features)	14s
Test Suite (stable, --all-features)	32s
Check (stable, --all-features)	5s
Lints (stable, --all-features)	7s
Test Suite (beta, --no-default-features)	26s
Lints (beta, --no-default-features)	10s
Check (beta, --no-default-features)	14s
Test Suite (beta, --all-features)	26s
Lints (beta, --all-features)	11s
Check (beta, --all-features)	13s
Test Suite (nightly, --no-default-features)	27s
Lints (nightly, --no-default-features)	14s
Check (nightly, --no-default-features)	11s
Test Suite (nightly, --all-features)	25s
Lints (nightly, --all-features)	14s
Check (nightly, --all-features)	14s
	5m 34s

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