Update pytest from 3.1.3 to 3.2.0 (#2675)

requirements/dev.txt

@@ -1,8 +1,8 @@
 # Dependencies needed only for development/testing.
 
-pytest==3.1.3 \
-    --hash=sha256:2a4f483468954621fcc8f74784f3b42531e5b5008d49fc609b37bc4dbc6dead1 \
-    --hash=sha256:095e1832f7e424563c95daf4d8d3c865052b80e139cdd2f9610a986ee8526206
+pytest==3.2.0 \
+    --hash=sha256:d994b4f28c6d449a467ad3d336544945a0dcf350e3b7b301219547ef5aa8125e \
+    --hash=sha256:0225cf10b9e173f84729d5f4648211458a222c6e53a77a85e104bc5f31c244ee
 
 django-debug-toolbar==1.8 \
     --hash=sha256:e9f08b94f9423ac76cfc287151182bbaddbe7521ae32bef9f9863e2ac58018d3 \