v0.1.3

• Added reformat nexus command to convert to nexus format
• subset command can now remove given sequences instead of keeping only them
• subset command can take a list in command line arguments
• Added addid command to append a string to all sequence names of an alignment
• Added random command to generate an random alignment
• Corrected bugs:
  • Authorize lower case characters
  • Corrected new lines in Fasta output