Ref genome validator - improvements

[khoroshevskyi]

I found that some of the files with hg38 reference genome are not validating correctly.
I am sure that this files are hg38, but stats are saying that they are in 4 rank - which is the worse one.

id: 4a614159d4f8a29da8b29b4df41eeb76

https://bedbase.org/bed/4a614159d4f8a29da8b29b4df41eeb76

More files could be found in this bedset: https://bedbase.org/bedset/gse271460