Fix clean.sh

Was ignoring editions with numerals in pathname
2016-01-03 18:02:49 +00:00 · 2016-01-03 18:02:49 +00:00 · f8723397e9
commit f8723397e9
--- a/bin/clean.sh
+++ b/bin/clean.sh
@ -2,4 +2,4 @@

 # Remove any output files

-find . -regex "^./editions/[a-z\.-]*/output/.*" -delete
+find . -regex "^./editions/[a-z0-9\.-]*/output/.*" -delete