Upgrade to setuptools==44.0.0 (#285)

This allows new features in setuptools, like find_namespace_packages.

Co-authored-by: lberki <[email protected]>

Author: XingChenKolmostar

python/requirements.txt

@@ -1,5 +1,5 @@
 pip==9.0.3
-setuptools==38.2.4
+setuptools==44.0.0
 wheel==0.30.0a0
 
 # For tests