python2Packages.unittest-sml-reporting: disable py2

```
builder for '/nix/store/5hqb6vylvzjj92db46wrzd3mp56vv1ms-python2.7-unittest-xml-reporting-3.0.2.drv' failed with exit code 1; last 10 log lines:
  no configure script, doing nothing
  building
  Executing setuptoolsBuildPhase
  Traceback (most recent call last):
    File "nix_run_setup", line 8, in <module>
      exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\\r\\n', '\\n'), __file__, 'exec'))
    File "setup.py", line 21, in <module>
      raise RuntimeError('This version requires Python 3.5+')  # pragma: no cover
  RuntimeError: This version requires Python 3.5+
  builder for '/nix/store/5hqb6vylvzjj92db46wrzd3mp56vv1ms-python2.7-unittest-xml-reporting-3.0.2.drv' failed with exi
```

1 files changed, 2 insertions, 1 deletions

diff --git a/pkgs/development/python-modules/unittest-xml-reporting/default.nix b/pkgs/development/python-modules/unittest-xml-reporting/default.nix
index 4481aedfaf9..113f5535f60 100644
--- a/pkgs/development/python-modules/unittest-xml-reporting/default.nix
+++ b/pkgs/development/python-modules/unittest-xml-reporting/default.nix
@@ -1,8 +1,9 @@
-{lib, fetchPypi, buildPythonPackage, six}:
+{lib, fetchPypi, buildPythonPackage, isPy27, six}:
 
 buildPythonPackage rec {
   pname = "unittest-xml-reporting";
   version = "3.0.2";
+  disabled = isPy27;
 
   propagatedBuildInputs = [six];