Fix typo in README #247

Job	Run time
Julia 1.6 - ubuntu-latest - x64	10m 52s
Julia 1.6 - ubuntu-latest - x86	13m 14s
Julia 1.6 - macOS-latest - x64	19m 3s
Julia 1.6 - windows-latest - x64	21m 26s
Julia 1.6 - windows-latest - x86	24m 27s
Julia 1 - ubuntu-latest - x64	9m 37s
Julia 1 - ubuntu-latest - x86	12m 49s
Julia 1 - macOS-latest - x64	9m 46s
Julia 1 - windows-latest - x64	10m 22s
Julia 1 - windows-latest - x86	17m 7s
Julia nightly - ubuntu-latest - x64	13m 36s
Julia nightly - macOS-latest - x64	14m 41s
Julia nightly - windows-latest - x64	15m 2s
	3h 12m 2s

Provide feedback