v0.8.1

• Add option -p or --show-partial to display PS and RadioText before
  completely received (disabled by default)
• Add support for EON variant 4 (alternative frequencies for other networks)
• Add support for LF/MF alternative frequencies
• Add support for frequency quantifiers in TMC
• Change the way alternative frequencies are printed (87.9 becomes "87.9 MHz")
  to allow for LF/MF frequencies
• Fix radiotext decoding for group 2B, thanks Anonymous
• Fix empty hex group printout at EOF