updating freebayes to 1.3.8

[erinyoung]

There's a new version of freebayes!

I will update this to a PR when a version with the pre-built binary becomes available.

I ran into this error :

3.519 Host machine cpu family: x86_64
3.519 Host machine cpu: x86_64
3.519 Found pkg-config: /usr/bin/pkg-config (0.29.2)
3.519 Run-time dependency liblzma found: YES 5.2.5
3.519 Run-time dependency libseqlib found: YES 1.0
3.519 Library tabixpp found: YES
3.519 Run-time dependency threads found: YES
3.519 Library libvcflib found: YES
3.519 
3.519 meson.build:33:0: ERROR: C++ shared or static library 'libwfa2' not found
3.519 
3.519 A full log can be found at /freebayes/build/meson-logs/meson-log.txt

And due to the release and commit history, I think the authors also encountered this issue and are working on fixing it.

Pull Request (PR) checklist:

• [] Include a description of what is in this pull request in this message.
• The dockerfile successfully builds to a test target for the user creating the PR. (i.e. docker build --tag samtools:1.15test --target test docker-builds/samtools/1.15 )
• Directory structure as name of the tool in lower case with special characters removed with a subdirectory of the version number (i.e. spades/3.12.0/Dockerfile)
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• Create a simple container-specific README.md in the same directory as the Dockerfile (i.e. spades/3.12.0/README.md)
  • If this README is longer than 30 lines, there is an explanation as to why more detail was needed
• Dockerfile includes the recommended LABELS
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