fix tf version

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setup.py

@@ -43,7 +43,7 @@ setup(
 	'statsmodels==0.11.1',
         'PyWavelets>=1.1.1',
         'pillow==7.1.2',
-        'tensorflow', # should be removed later
+        'tensorflow==2.2', # should be removed later
         'keras', # should be removed later
         'pyod',
         'nimfa==1.4.0',