Update setuptools from 44.0.0 to 45.0.0 (#187)

Author: pyup-bot

requirements_dev.txt

@@ -11,6 +11,6 @@ pip==19.3.1
 psycopg2-binary==2.8.4
 pyflakes==2.1.1
 pycodestyle==2.5.0
-setuptools==44.0.0
+setuptools==45.0.0
 twine==1.15.0  # Last version to support Python 3.5
 wheel==0.33.6