eclean-kernel -n 3 removed all kernels but current one

Today `eclean-kernel -n 3` removed 4.15.0 I just compiled leaving only current one (4.14.14). Rationale given was `old`. 

```
== 4.15.0-gentoo ==
Rationale:
[-] old
Files:
- /boot/vmlinuz-4.15.0-gentoo
- /usr/src/linux-4.15.0-gentoo
- /lib/modules/4.15.0-gentoo
- /boot/System.map-4.15.0-gentoo
- /boot/config-4.15.0-gentoo
- /boot/initramfs-4.15.0-gentoo.img
```