Update hmtnames.csv

added a label for Sosigenes, found a reference to who he was here: http://books.google.com/books?id=txALAQAAMAAJ&pg=PA244&lpg=PA244&dq=sosigenes+edition+of+homer&source=bl&ots=EHy4fDtUDZ&sig=OewlsDn55dKX036xANuw7IG5TSM&hl=en&sa=X&ei=vfG_U8O2KeinsQS4moDwAw&ved=0CEMQ6AEwCA#v=onepage&q=sosigenes%20edition%20of%20homer&f=false