Merge pull request #23 from source-nerd/pyup-update-urllib3-1.24.1-to-1.25.3

Update urllib3 to 1.25.3

Author: source-nerd

requirements.txt

@@ -15,4 +15,4 @@ pytz==2019.1
 requests==2.21.0
 six==1.12.0
 soupsieve==1.9
-urllib3==1.24.1
+urllib3==1.25.3