Update ipdb from 0.10.3 to 0.11

Author: pyup-bot

requirements-dev.txt

@@ -8,7 +8,7 @@ coverage==4.4.2
 docker==2.6.1
 docker-compose==1.17.1
 flake8==3.5.0
-ipdb==0.10.3
+ipdb==0.11
 motor==1.1
 pytest-cov==2.5.1
 pytest-sugar==0.9.0