v1.5.1

Documentation: http://periodictable.readthedocs.org

1.5.1 2019-09-09

Modified:

• fasta uses natural abundance of H for biomolecule when computing the
  D2O contrast match rather than the biomolecule with pure H[1].
• remove half-life units from column header in activation table since
  each row gives its own units.

See README.rst for complete history.