Update pytest from 3.2.0 to 3.2.1

tests/ui/requirements.txt

@@ -1,7 +1,7 @@
 fxapom==1.10.1
 PyJWT==1.5.2
 PyPOM==1.2.0
-pytest==3.2.0
+pytest==3.2.1
 pytest-instafail==0.3.0
 pytest-selenium==1.11.0
 pytest-variables==1.7.0