ROCm 3.5 supports Ubuntu 18.04 with kernel 5.3

[grische]

System information

• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Ubuntu 18.04

Describe the bug
When using a current version of Ubuntu 18.04, you will have kernel 5.3 installed. But ret complains about the installations:

===========================================================================================================================================================
[+] [STEP:2/12] Checking OS...
===========================================================================================================================================================
        OS                           ..........  ✔ Ubuntu
        RELEASE                      ..........  ✔ 18.04
        KERNEL                       ..........  ✘ 5.3.0-59-generic
        ARCH                         ..........  ✔ amd64

[WARNING] OS kernel Not Supported!...[5.3.0-59-generic]

[INFO] A kernel update to version 5.0 is required to complete this setup.

[INFO] The Kernel 5.0 is Already Installed! Please Reboot The System With This Kernel

While ROCm release notes state that Ubuntu 18.04 with kernel 5.3 is supported:
https://rocmdocs.amd.com/en/latest/Current_Release_Notes/Current-Release-Notes.html#amd-rocm-release-notes-v3-5-0

Expected behaviour

1. Support kernel 5.3 with Ubuntu 18.04
2. Do not issue a warning about "kernel update" if it is actually a "kernel downgrade"