jackalope 1.0.0

• create_variants performs better with high mutation rates
• Substitutions now use a random-site, discrete-Gamma model for among-site variability (optionally with invariant sites), rather than a fixed-sites model
• No longer depends on vcfR package, instead using htslib for reading VCF files
• Indel creation now uses “tau-leaping” approximation to the Doob-Gillespie algorithm
• Substitutions are added by calculating transition-probability matrices and sampling for substitutions at each site