remove readthedocs

README.md

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 [![Coverage Status](https://coveralls.io/repos/github/sigsep/sigsep-mus-db/badge.svg?branch=master)](https://coveralls.io/github/sigsep/sigsep-mus-db?branch=master)
 [![Latest Version](https://img.shields.io/pypi/v/musdb.svg)](https://pypi.python.org/pypi/musdb/)
 [![Supported Python versions](https://img.shields.io/pypi/pyversions/musdb.svg)](https://pypi.python.org/pypi/musdb/)
-[![Docs Status](https://readthedocs.org/projects/musdb/badge/?version=latest)](https://musdb.readthedocs.org/en/latest/)
 
 A python package to parse and process the [MUSDB18 dataset](https://sigsep.github.io/musdb), the largest open access dataset for music source separation. The tool was originally developed for the [Music Separation task](sisec18.unmix.app) as part of the [Signal Separation Evaluation Campaign (SISEC)](https://sisec.inria.fr/). 
 
@@ -210,4 +209,4 @@ track.targets['linear_mixture'].audio
 
 ## License
 
-MIT 
+MIT