Update isort from 4.3.10 to 4.3.15

pyup-bot · tony · commit b36152200570 · 2019-03-12T09:13:40.000+01:00
diff --git a/requirements/dev.txt b/requirements/dev.txt
@@ -1,2 +1,2 @@
-isort==4.3.10
+isort==4.3.15
 flake8==3.7.5
