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librosa/librosa: 0.7.2

Brian McFee; Vincent Lostanlen; Matt McVicar; Alexandros Metsai; Stefan Balke; Carl Thomé; Colin Raffel; Ayoub Malek; Dana Lee; Frank Zalkow; Kyungyun Lee; Oriol Nieto; Jack Mason; Dan Ellis; Ryuichi Yamamoto; Scott Seyfarth; Eric Battenberg; Виктор Морозов; Rachel Bittner; Keunwoo Choi; Josh Moore; Ziyao Wei; Shunsuke Hidaka; nullmightybofo; Pius Friesch; Fabian-Robert Stöter; Darío Hereñú; Taewoon Kim; Matt Vollrath; Adam Weiss

This is primarily a bug-fix release, and most likely the last release in the 0.7 series.

It includes fixes for errors in dynamic time warping (DTW) and RMS energy calculation, and several corrections to the documentation.

Inverse-liftering is now supported in MFCC inversion, and an implementation of mu-law companding has been added.

Please refer to the documentation for a full list of changes.

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