Fix readme content-type #53

Job	Run time
Build wheels on ${{ matrix.platform }}	0s
Test on ${{ matrix.distro }} ${{ matrix.arch }}	0s
Build wheels for ${{ matrix.arch }} (skip ${{ matrix.skip_image }})	0s
Build sdist	0s
Test debug build on Ubuntu --warning-as-error --debug	42s
Test on pypy-3.8	26s
Test debug build on Ubuntu --warning-as-error --debug --multi-phase-init	1m 17s
Test on ubuntu-latest x64 --warning-as-error	33s
Test on pypy-3.9	27s
Test on ubuntu-latest x64 --warning-as-error --multi-phase-init	32s
Test on ubuntu-latest x64 --warning-as-error --cffi	38s
Test on pypy-3.10	27s
Test on macos-latest x64 --warning-as-error	1m 11s
Test on macos-latest x64 --warning-as-error --multi-phase-init	53s
Test on macos-latest x64 --warning-as-error --cffi	58s
Test on windows-latest x64 --warning-as-error	1m 40s
Test on windows-latest x64 --warning-as-error --multi-phase-init	1m 23s
Test on windows-latest x64 --warning-as-error --cffi	1m 4s
Test on windows-latest x86 --warning-as-error	1m 32s
Test on windows-latest x86 --warning-as-error --multi-phase-init	1m 32s
Test on windows-latest x86 --warning-as-error --cffi	1m 36s
Publish to PyPI	0s
	16m 51s

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