azimuth equation in readme.md need abit of change

[R-fadhil]

sir your equation to change radiant into azimuth needs a bit of change..
it doesn't fit with the app's result

i use this one
sunrisedata.azimu = 180 - (-1*(sunriseData.azimuth * 180 / Math.PI));

the result of that equation will fit with the app