fix version to 2.1.0 #149

Job	Run time
test (ubuntu-latest, 3.7, 1.10)	1m 47s
test (ubuntu-latest, 3.7, 2)	1m 52s
test (ubuntu-latest, 3.8, 1.10)	2m 17s
test (ubuntu-latest, 3.8, 2)	1m 54s
test (ubuntu-latest, 3.9, 1.10)	2m 4s
test (ubuntu-latest, 3.9, 2)	2m 16s
test (ubuntu-latest, 3.10, 1.10)	2m 42s
test (ubuntu-latest, 3.10, 2)	2m 18s
test (ubuntu-latest, 3.11, 1.10)	1m 54s
test (ubuntu-latest, 3.11, 2)	1m 53s
test (ubuntu-latest, 3.12, 1.10)	1m 56s
test (ubuntu-latest, 3.12, 2)	4m 25s
test (ubuntu-latest, pypy3.10, 2)	2m 45s
test (macos-latest, 3.7, 2)	1m 48s
test (macos-latest, 3.8, 2)	1m 53s
test (macos-latest, 3.9, 2)	2m 24s
test (macos-latest, 3.10, 2)	2m 11s
test (macos-latest, 3.11, 2)	2m 25s
test (macos-latest, 3.12, 2)	2m 40s
test (macos-latest, pypy3.10, 2)	4m 14s
Build wheels on ubuntu-latest	18m 57s
Build wheels on windows-latest	11m 38s
Publish docs	1m 34s
Build wheels on macos-latest	6m 6s
Publish wheels	2m 24s
	1h 28m 17s

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