Update pytest from 3.6.1 to 3.6.2

requirements/prod.txt

@@ -281,9 +281,9 @@ pyquery==1.4.0 \
     --hash=sha256:07987c2ed2aed5cba29ff18af95e56e9eb04a2249f42ce47bddfb37f487229a3 \
     --hash=sha256:4771db76bd14352eba006463656aef990a0147a0eeaf094725097acfa90442bf
 # pytest is required by amo-validator
-pytest==3.6.1 \
-    --hash=sha256:26838b2bc58620e01675485491504c3aa7ee0faf335c37fcd5f8731ca4319591 \
-    --hash=sha256:32c49a69566aa7c333188149ad48b58ac11a426d5352ea3d8f6ce843f88199cb
+pytest==3.6.2 \
+    --hash=sha256:90898786b3d0b880b47645bae7b51aa9bbf1e9d1e4510c2cfd15dd65c70ea0cd \
+    --hash=sha256:8ea01fc4fcc8e1b1e305252b4bc80a1528019ab99fd3b88666c9dc38d754406c
 # python-dateutil is required by elasticsearch-dsl
 python-dateutil==2.7.3 \
     --hash=sha256:1adb80e7a782c12e52ef9a8182bebeb73f1d7e24e374397af06fb4956c8dc5c0 \