1.4.0 (2020-01-26)

Changes since 1.3.0 (2019-05-15).

Special Attention

• Closes #552: Drop support for Python 2.7 [bc939c0] (Reece Hart)
• Remove Biopython dependency (#527) [3a74978] (Alan Rubin)
• Removed enum34 dependency [e93a48c] (Reece Hart)