Update setuptools from 40.6.2 to 40.6.3

Author: pyup-bot

requirements.txt

@@ -22,7 +22,7 @@ pytest-cov==2.6.0
 pytest-watch==4.2.0     
 PyYAML==3.13      
 requests==2.21.0    
-setuptools==40.6.2    
+setuptools==40.6.3    
 six==1.12.0    
 urllib3==1.24.1    
 watchdog==0.9.0