[requires.io] dependency update

requires · requires · commit 4d32b4cf9850 · 2018-02-11T03:01:40.000Z
diff --git a/test_requirements.txt b/test_requirements.txt
@@ -1,5 +1,5 @@
 pytest==3.4.0
 pytest-cov==2.5.1
-coverage==4.5
+coverage==4.5.1
 pytest-xdist==1.22.0
 hypothesis
