upgrade pytest

whtsky · whtsky · commit 4f2cd57ee9df · 2018-02-11T16:52:38.000+08:00
diff --git a/dev-requirements.txt b/dev-requirements.txt
@@ -1,4 +1,4 @@
-pytest==3.0.5
+pytest==3.4.0
 coverage==4.3.1
 cython==0.27.3
 tox==2.5.0
