v0.3.8.1

• --regex option for faidx script allows matching only certain records (#55)
• filt_function argument for Faidx and Fasta allows filtering certain records based on a matching function (@jsilter)
• fixed a bug (#56) when calling FastaRecord.long_name when using filt_function or split_char.
• fai index is not created if the modification time == fasta file (#66)