Fix typo

src/stub

         echo "    -R            skip creating README.md"
         echo "    -M            skip creating Makefile"
         echo "    -P            skip creating packaging templates"
-        echo "    -L            list know licenses and exit"
+        echo "    -L            list known licenses and exit"
         echo ""
         echo "PKGNAME should be packaging-friendly name, ie. consist"
         echo "only of small letters, numbers, underscore and dash."