Update environment.yml

use soundfile instead

Author: pkendrick

docs/environment.yml

@@ -11,7 +11,7 @@ dependencies:
     - numba==0.51.*
     - pandas==1.0.*
     - pretty_midi==0.2.*
-    - pysoundfile==0.9.*
+    - soundfile==0.9.*
     - scipy==1.3.*
     - numpy==1.17.*
     # - libfmp  # using a freshly downloaded version of libfmp in the ci script