add sdist environment to tox

This allows building of the sdist via tox -e sdist, which will place
the result in ~/.tox/distshare for use by git-explode.

1 files changed, 3 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index 28b064f..2adcad0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,3 +24,6 @@ commands = flake8 setup.py git_deps tests
 # Options for pytest
 [pytest]
 addopts = -rsxXf
+
+[testenv:sdist]
+usedevelop = False