Revert "Update to 3.3.0"

This reverts commit 9faa2fb.

Conflicts:
	recipe/meta.yaml

This needed to be reverted because we cannot build cryptography
with 3.3.0 due to pytest-dev/pytest#2957

.. we can remove this commit when 3.3.1 comes out.

recipe/meta.yaml

@@ -1,6 +1,6 @@
 {% set name = "pytest" %}
-{% set version = "3.3.0" %}
-{% set sha256 = "6db1c070aa412c30647b6aeb13c55670f900cf00fbafa003cdde560c3f4a8d76" %}
+{% set version = "3.2.5" %}
+{% set sha256 = "6d5bd4f7113b444c55a3bbb5c738a3dd80d43563d063fc42dcb0aaefbdd78b81" %}
 
 package:
   name: {{ name|lower }}
@@ -26,12 +26,10 @@ requirements:
   run:
     - python
     - setuptools
-    - py >=1.5.0
     - funcsigs  # [py27]
+    - py >=1.4.33
+    - argparse  # [py26]
     - colorama  # [win]
-    - six >=1.10.0
-    - attrs >=17.2.0
-    - pluggy >=0.5,<0.7
 
 test:
   commands: