update readme

README.md

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-# Noise reduction in python using 
+# Noise reduction in python using spectral gating
 - This algorithm is based (but not completely reproducing) on the one [outlined by Audacity](https://wiki.audacityteam.org/wiki/How_Audacity_Noise_Reduction_Works) for the **noise reduction effect** ([Link to C++ code](https://github.com/audacity/audacity/blob/master/src/effects/NoiseReduction.cpp))
 - The algorithm requires two inputs: 
     1. A *noise* audio clip comtaining prototypical noise of the audio clip