wrong log assembly info

[stolarczyk]

even though the selected assembly is hg19 (and correct files are downloaded), the log says "assembly: GRCh38"

[mjs5kd@udc-ba36-36 regions](master): python3.6 encode_downloader.py "https://www.encodeproject.org/experiments/ENCSR435FGK/" --file-types bed --assemblies hg19
['ENCSR435FGK']
========== ENCSR435FGK ==========
assembly: GRCh38
Downloading (bed): https://www.encodeproject.org/files/ENCFF622WUZ/@@download/ENCFF622WUZ.bed.gz, rep:[1, 2], pair:-1
Continuing in background, pid 110652.
Downloading (bed): https://www.encodeproject.org/files/ENCFF376YZE/@@download/ENCFF376YZE.bed.gz, rep:[1], pair:-1
Continuing in background, pid 110712.
Downloading (bed): https://www.encodeproject.org/files/ENCFF279OIN/@@download/ENCFF279OIN.bed.gz, rep:[2], pair:-1
Continuing in background, pid 110719.
Downloading (bed): https://www.encodeproject.org/files/ENCFF562TNH/@@download/ENCFF562TNH.bed.gz, rep:[1, 2], pair:-1
Continuing in background, pid 110730.

[leepc12]

This is actually not a bug but remove that confusing info assembly: GRCh38. It's a default assembly when users don't specify --assemblies.