different behavior for bed or bed.gz on bed_to_multivec

https://github.com/higlass/clodius/blob/c119237c81ecb7298683e4c4768f555ff441e090/clodius/multivec.py#L19
If the file is bed.gz, the lines are read as binary and epilogos/state options work. But if the file is not gzipped, the lines are read as text, and the deafault option works. There is a decode/encode mismatch in the alternative scenarios.
We thought we would leave this issue to you to decide which convention you want to follow.