Code review comment for lp:~thumper/juju-core/support-string-slice-args

LGTM, thanks.
One suggestion below.

https://codereview.appspot.com/39150045/diff/10004/cmd/args_test.go
File cmd/args_test.go (right):

https://codereview.appspot.com/39150045/diff/10004/cmd/args_test.go#newcode21
cmd/args_test.go:21: func (*ArgsSuite) TestNewStringsValue(c *gc.C) {
It'd be quite nice to see at least one test that tests it as it is
intended to be used (in a FlagSet). ISTM that this test could be easily
adapted to do that.

https://codereview.appspot.com/39150045/