Update README.md

src/modules/initramfs/README.md

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 This module is specific to Debian based distros. Post installation on Debian
 the initramfs needs to be updated so as to not interrupt the boot process
 with a error about fsck.ext4 not being found.
+
+## Debian specific notes
+
+If you're using live-build to build your ISO and setup the runtime env
+make sure that you purge the live-\* packages on the target system
+before running this module, since live-config dpkg-diverts update-initramfs
+and can cause all sorts of fun issues.