Rust

Add binding for Bitset::is_empty, bump version to 2.2.0 #388

Job	Run time
Test on ubuntu-latest using Rust stable with features ''	30s
Test on ubuntu-latest using Rust stable with features 'alloc'	49s
Test on ubuntu-latest using Rust stable with features 'default'	51s
Test on ubuntu-latest using Rust nightly with features ''	39s
Test on ubuntu-latest using Rust nightly with features 'alloc'	44s
Test on ubuntu-latest using Rust nightly with features 'default'	3m 12s
Test on windows-latest using Rust stable with features ''	3m 59s
Test on windows-latest using Rust stable with features 'alloc'	2m 36s
Test on windows-latest using Rust stable with features 'default'	3m 6s
Test on windows-latest using Rust nightly with features ''	2m 59s
Test on windows-latest using Rust nightly with features 'alloc'	3m 40s
Test on windows-latest using Rust nightly with features 'default'	5m 0s
Test on macos-latest using Rust stable with features ''	30s
Test on macos-latest using Rust stable with features 'alloc'	51s
Test on macos-latest using Rust stable with features 'default'	47s
Test on macos-latest using Rust nightly with features ''	39s
Test on macos-latest using Rust nightly with features 'alloc'	43s
Test on macos-latest using Rust nightly with features 'default'	1m 38s
	33m 13s

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