Update isort from 4.3.12 to 4.3.15

pyup-bot · pyup-bot · commit 63dd7382b0d1 · 2019-03-18T15:10:15.000+01:00
diff --git a/requirements-test.txt b/requirements-test.txt
@@ -7,5 +7,5 @@ mock==2.0.0
 # Code style
 flake8==3.7.7
 # black
-isort==4.3.12
+isort==4.3.15
 pre-commit==1.14.4
