Add classifier for MacOS

Signed-off-by: Julien Jerphanion <[email protected]>

Author: jjerphan

setup.cfg

@@ -10,6 +10,7 @@ classifiers =
     Programming Language :: Python :: 3
     Operating System :: POSIX :: Linux
     Operating System :: Microsoft :: Windows
+    Operating System :: MacOS
     Topic :: Database
     Topic :: Database :: Database Engines/Servers
 url = https://github.com/man-group/arcticdb
@@ -34,7 +35,7 @@ install_requires =
     # conda-forge's package and feedstock browser.
     #
     # See: https://conda-forge.org/feedstock-outputs/
-    numpy 
+    numpy
     pandas
     attrs
     dataclasses ; python_version < '3.7'