Update isort from 4.3.13 to 4.3.15 (#595)

pyup-bot · sliverc · commit 75a0878a5699 · 2019-03-12T20:17:55.000+01:00
diff --git a/requirements-development.txt b/requirements-development.txt
@@ -6,7 +6,7 @@ factory-boy==2.11.1
 Faker==1.0.2
 flake8==3.7.7
 flake8-isort==2.6.0
-isort==4.3.13
+isort==4.3.15
 mock==2.0.0
 pytest==4.3.1
 pytest-cov==2.6.1
