Code review comment for ~paul-martin-1/cirros:paulm/fixes

> Update source versions in bin/build-release.
...
> NB. The given version of Ubuntu's Linux kernel is the last to contain a
> i386 build.

This comment is just wrong.
There are i386 kernels for 18.04 (4.15).

I put up a merge proposal at
 https://code.launchpad.net/~smoser/cirros/+git/cirros/+merge/367475
which adds downloading support for the 4.15.

I'm testing now with './bin/grab-kernels 4.15.0-50.54'