Add test for spinning a single file

Test spinning a single file with App::DocKnot::Spin and change
just enough to get the test to pass.  Hard-code the old version
number for now, since there doesn't seem to be an immediately
obvious way to get it.  Don't use standard output when spinning
a single file since it confuses prove somehow.

1 files changed, 0 insertions, 0 deletions

diff --git a/t/data/spin/output/names.png b/t/data/spin/output/names.png
new file mode 100644
index 0000000..c54a4bf
--- /dev/null
+++ b/t/data/spin/output/names.png