chore: version bump to 2.1.0 #376

Job	Run time
Test on ubuntu-latest using Rust stable with features ''	31s
Test on ubuntu-latest using Rust stable with features 'alloc'	39s
Test on ubuntu-latest using Rust stable with features 'default'	54s
Test on ubuntu-latest using Rust nightly with features ''	38s
Test on ubuntu-latest using Rust nightly with features 'alloc'	38s
Test on ubuntu-latest using Rust nightly with features 'default'	3m 24s
Test on windows-latest using Rust stable with features ''	2m 7s
Test on windows-latest using Rust stable with features 'alloc'	2m 35s
Test on windows-latest using Rust stable with features 'default'	3m 9s
Test on windows-latest using Rust nightly with features ''	2m 36s
Test on windows-latest using Rust nightly with features 'alloc'	2m 12s
Test on windows-latest using Rust nightly with features 'default'	4m 40s
Test on macos-latest using Rust stable with features ''	37s
Test on macos-latest using Rust stable with features 'alloc'	37s
Test on macos-latest using Rust stable with features 'default'	52s
Test on macos-latest using Rust nightly with features ''	57s
Test on macos-latest using Rust nightly with features 'alloc'	58s
Test on macos-latest using Rust nightly with features 'default'	1m 44s
	29m 48s

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