Remove comma in README.rst #1221

Job	Run time
Python 3.8 on ubuntu-latest	1m 59s
Python 3.8 on macos-latest	4m 5s
Python 3.8 on windows-latest	3m 18s
Python 3.9 on ubuntu-latest	2m 7s
Python 3.9 on macos-latest	2m 51s
Python 3.9 on windows-latest	4m 22s
Python 3.10 on ubuntu-latest	2m 30s
Python 3.10 on macos-latest	3m 6s
Python 3.10 on windows-latest	3m 28s
Python 3.11 on ubuntu-latest	1m 52s
Python 3.11 on macos-latest	2m 57s
Python 3.11 on windows-latest	4m 12s
Python pypy-3.7 on ubuntu-latest	3m 12s
Python pypy-3.7 on macos-latest	8m 0s
Python pypy-3.7 on windows-latest	8m 38s
Python 3.6 on ubuntu-20.04	1m 30s
Python 3.7 on ubuntu-20.04	1m 46s
	59m 53s

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