v0.6.2

v0.6.2 contains backwards-compatible enhancements to the Python library (thanks @apcamargo!):

• Add new dunder methods (__hash__, __eq__, __len__, __str__, and __repr__) to needletail.Record
• needletail.Record instances can now be created directly
• record.normalize() now takes iupac argument (default=False)
• parse_fastx_file can now take a pathlib.Path