Update README.md

[Tom-Willemsen]

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[iangillingham-stfc]

The change definitely fixes the issue with incorrectly named 'emulator_protocol'. I'm assuming that the properties 'emulator_path' and 'emulator_package' are following the same pattern, so will approve.

[Tom-Willemsen]

https://github.com/ISISComputingGroup/EPICS-IOC_Test_Framework/blob/master/utils/emulator_launcher.py#L590

[iangillingham-stfc]

I tried to approve this PR, but it only allowed me to leave a comment.