Potential to install wrong kernel?

The help output says:
>You don't have to prefix with `v`. E.g. `-i 4.9` is the same as `-i v4.9`.

However the output of `ubuntu-mainline-kernel.sh -r 4.9` ends with:
```none
v4.14.98        v4.14.99        v5.4.9
```
Omitting the `v` enables substring matches which can lead to install making the wrong choice.

It seems better to treat `4.9` as `v4.9.`, internally.