Update freebayes to 1.3.8

[BiocondaBot]

Update freebayes: 1.3.7 → 1.3.8

Info	Link or Description
Recipe	recipes/freebayes (click to view/edit other files)
Summary	Bayesian haplotype-based polymorphism discovery and genotyping
Home	https://github.com/freebayes/freebayes
Releases	https://github.com/freebayes/freebayes/tags
Recipe Maintainer(s)	@jpuritz
Author	@freebayes

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