SSM v1.2.0

BEAST v2.7 compatible

SSM v1.1.0

For BEAST v2.5.0

Standard Nucleotide Substitution Models v1.0.1

Create LICENSE and DOI.

Standard Nucleotide Substitution Models v1.0.0

update version

Standard Nucleotide Substitution Models

add Unit tests, and few methods to print Q and rates.

Standard Nucleotide Substitution Models

v0.0.2

add substitution model code and frequencies to the items in the drop …