v0.6.16

StatsModels v0.6.16

Diff since v0.6.15

Closed issues:

• Make ModelFrame work with an iterable of named tuples (#5)
• Avoid hard-coding for concrete implementations (#14)

Merged pull requests:

• use trigger to run tagbot instead of cron (#197) (@kleinschmidt)
• Switch CI to github actions and remove Travis (#199) (@kleinschmidt)
• fix missing methods for + (#200) (@kleinschmidt)