Update README.md using measureit instead of measureit

[kinow]

Hi,

Running the following,

import pyRAPL

# sudo chmod -R a+r /sys/class/powercap/intel-rapl
pyRAPL.setup()

@pyRAPL.measureit
def foo():
  import autosubmit


foo()

After doing a pip install pyrapl resulted in an error. Looking at the __init__.py here, I found the measureit, and that worked (after this other workaround).

Thanks