[client] Restore version

Author: Samuel Hassine

requirements.txt

@@ -8,5 +8,5 @@ pytz==2021.1
 pika==1.2.0
 sseclient==0.0.27
 black==20.8b1
-python-magic==0.4.20; sys_platform == 'linux' or sys_platform == 'darwin'
+python-magic==0.4.18; sys_platform == 'linux' or sys_platform == 'darwin'
 python-magic-bin==0.4.14; sys_platform == 'win32'

setup.py

@@ -58,7 +58,7 @@ def run(self):
         "pytz==2021.1",
         "pika==1.2.0",
         "sseclient==0.0.27",
-        "python-magic==0.4.20;sys.platform=='linux' or sys.platform=='darwin'",
+        "python-magic==0.4.18;sys.platform=='linux' or sys.platform=='darwin'",
         "python-magic-bin==0.4.14;sys.platform=='win32'",
     ],
     cmdclass={"verify": VerifyVersionCommand},