High pass filter equation to be updated

[design-tm21]

Thanks a lot for this very useful project!

A correction is required to the High pass filter equation as per the authors of the original paper. Please refer to the errata section at the end of the paper: https://courses.cs.washington.edu/courses/cse474/18wi/labs/l8/QRSdetection.pdf .
The revised difference equation for the High pass filter is:
y(nT) = y(nT-T) - x(nT)/32 + x(nT-16T) - x(nT-17T) + x(nT-32T)/32
So the implementation for the same has to be updated accordingly in this project.

Also, note that the authors have derived all the equations in this paper for a sampling frequency of 200 Hz. If a sampling frequency of 360 Hz is used (as it is in the current project), then the cutoff frequencies will be a bit different than the intended 5 Hz to 11 Hz pass band.