Add test for Python 3.10

[prisae]

PR to test when it will pass the test. The limiting factor is usually the availability of numba on conda-forge for a new Python version: https://anaconda.org/conda-forge/numba

[coveralls]

Pull Request Test Coverage Report for Build 1732950781

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.856%

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Totals
Change from base Build 1682572615:	0.0%
Covered Lines:	4152
Relevant Lines:	4158

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💛 - Coveralls