Update pytest from 3.8.1 to 3.8.2 (#4092)

requirements/dev.txt

@@ -1,8 +1,8 @@
 # Dependencies needed only for development/testing.
 
-pytest==3.8.1 \
-    --hash=sha256:0a72d8a9f559c006ba153e0c9b4838efd7b656cf1f993747ba7128770d6eb12c \
-    --hash=sha256:95529588ff4e85114a0b0ad8e9cf0131ca47d46b28230e25366c5aba66b1d854
+pytest==3.8.2 \
+    --hash=sha256:7e258ee50338f4e46957f9e09a0f10fb1c2d05493fa901d113a8dafd0790de4e \
+    --hash=sha256:9332147e9af2dcf46cd7ceb14d5acadb6564744ddff1fe8c17f0ce60ece7d9a2
 
 django-debug-toolbar==1.10.1 \
     --hash=sha256:1dcae28d430522debafde2602b3450eb784410b78e16c29a00448032df2a4c90 \