v1.6.0

Release 1.6.0

Notable new features and improvements

• Restructure base classes to generalize for oligos [#57]
• Allow primer design with thermodynamic models [#66, #67, #68]
• Change default objective to maximize activity [#70]

Minor changes

• Clean up and improve descriptions of several arguments [9e4b379, c59807c, 8a6c6c3, 484d78f]
• Change continuous integration testing to use GitHub Actions [#71]

Bug fixes

• Fix bug when hashing k-mers, e.g., for representative potential guides [#69]