[requires.io] dependency update

requires · requires · commit 28af630a76dd · 2018-09-03T17:06:35.000-07:00
diff --git a/test_requirements.txt b/test_requirements.txt
@@ -1,3 +1,3 @@
 pytest==3.7.4
-pytest-cov==2.5.1
+pytest-cov==2.6.0
 hypothesis
