accession numbers in emp_nb_Viburnum.ipynb

[fanhuan]

Seems to be from the Quercus dataset:

"""
Download the sequence data
Sequence data for this study is archived on the NCBI sequence read archive (SRA). The data were run in two separate Illumina runs, but are combined under a single project id number.

Project SRA: SRP055977
Project number: PRJNA277574
Biosample numbers: SAMN03394519 -- SAMN03394561
Runs: SRR1915524 -- SRR1915566
...
"""