See,

$ find . -name "*.sh" | xargs shellcheck -i SC2045

In ./roll-tarballs.sh line 220:
for f in $(ls README* 2>/dev/null); do
         ^-----------------------^ SC2045: Iterating over ls output is fragile. Use globs.

For more information:
  https://www.shellcheck.net/wiki/SC2045 -- Iterating over ls output is fragi...
Signed-off-by: Mario Trangoni <mjtrangoni@gmail.com>