get_tests.py: Disable one test on Travis Windows

XMLBearDTDUrlTest.test_valid_files is consistently failing only
on Travis Windows, but not AppVeyor.

Related to coala#2944

.ci/get_tests.py

@@ -139,6 +139,12 @@ def get_pytest_deselected_tests(args, tests):
     if 'tests/php/PHPMessDetectorBearTest.py' in tests:
         not_list.append('test_cleancode_violation')
 
+    # https://github.com/coala/coala-bears/issues/2944
+    if 'tests/xml2/XMLBearTest.py' in tests:
+        if 'win' in args and os.environ.get('TRAVIS'):
+            not_list.append(
+                'tests/xml2/XMLBearTest.py::XMLBearDTDUrlTest::test_valid_files')
+
     return not_list