don't install when linting with flake8

This is a needless waste of time.  Why on earth aren't these sensible
defaults?  I've filed issues in PyScaffold.

1 files changed, 1 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index 072c074..28b064f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,6 +16,7 @@ deps =
     -r{toxinidir}/requirements.txt
 
 [testenv:flake8]
+skip_install = True
 changedir = {toxinidir}
 deps = flake8
 commands = flake8 setup.py git_deps tests