chore: version bump to 2.1.0 #374

Job	Run time
Test on ubuntu-latest using Rust stable with features ''	31s
Test on ubuntu-latest using Rust stable with features 'alloc'	38s
Test on ubuntu-latest using Rust stable with features 'default'	54s
Test on ubuntu-latest using Rust nightly with features ''	36s
Test on ubuntu-latest using Rust nightly with features 'alloc'	42s
Test on ubuntu-latest using Rust nightly with features 'default'	3m 16s
Test on windows-latest using Rust stable with features ''	2m 8s
Test on windows-latest using Rust stable with features 'alloc'	3m 28s
Test on windows-latest using Rust stable with features 'default'	2m 48s
Test on windows-latest using Rust nightly with features ''	1m 57s
Test on windows-latest using Rust nightly with features 'alloc'	3m 16s
Test on windows-latest using Rust nightly with features 'default'	5m 32s
Test on macos-latest using Rust stable with features ''	28s
Test on macos-latest using Rust stable with features 'alloc'	32s
Test on macos-latest using Rust stable with features 'default'	47s
Test on macos-latest using Rust nightly with features ''	51s
Test on macos-latest using Rust nightly with features 'alloc'	1m 6s
Test on macos-latest using Rust nightly with features 'default'	1m 46s
	31m 16s

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