missing rmats_mat_path_manifest and rmats_sample_order example files

[mguaita]

Hello,

I am not able to find the files rmats_mat_path_manifest and rmats_sample_order for the format function in the "example" folder of the IRIS github, where can I find them?

Thank you,
Maria

[EricKutschera]

The example dataset was updated in IRIS v2.0.0 to start after the format step, but that part of the README still references the old files. The example from v1.0.0 includes those files as matrices.txt and samples.txt: https://github.com/Xinglab/IRIS/tree/v1.0.0/example/SJ_matrices

I made this change to fix the README reference: #16