Remove py2 and Windows checks.

Removed because python 2 is no longer supported, and this let us remove the
checks for Windows too.

Author: alexandermorgan

pvlib/test/test_conftest.py

@@ -1,11 +1,8 @@
 import pytest
 
-from conftest import fail_on_pvlib_version, platform_is_windows, has_python2
+from conftest import fail_on_pvlib_version
 
 
-# allow xpass for python 2 on windows
-@pytest.mark.xfail(strict=(not (platform_is_windows and has_python2)),
-                   reason='fail_on_pvlib_version should cause test to fail')
 @fail_on_pvlib_version('0.0')
 def test_fail_on_pvlib_version():
     pass
@@ -16,8 +13,6 @@ def test_fail_on_pvlib_version_pass():
     pass
 
 
-@pytest.mark.xfail(strict=(not (platform_is_windows and has_python2)),
-                   reason='ensure that the test is called')
 @fail_on_pvlib_version('100000.0')
 def test_fail_on_pvlib_version_fail_in_test():
     raise Exception