Merge pull request #230 from nextstrain/feat/mutation-units #1061

Job	Run time
pathogen-ci (docker) / workflow-context	4s
pathogen-ci (conda) / workflow-context	2s
pathogen-ci (conda) / run-build	2m 3s
pathogen-ci (docker) / run-build	1m 48s
	3m 57s

Provide feedback