add gfa1

[alienzj]

Describe your pull request here

A command-line tool as well as a library in C that parses, validates and transforms assembly graphs in a dialect of the GFA1 format.

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[alienzj]

@bioconda/core Need help, please!

[dpryan79]

@bioconda-bot please fetch artifacts

[BiocondaBot]

Package(s) built on Azure are ready for inspection:

Arch	Package	Zip File
linux-64	gfa1-0.53.alpha-h7132678_0.tar.bz2	LinuxArtifacts
osx-64	gfa1-0.53.alpha-h1f540d2_0.tar.bz2	OSXArtifacts

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You may also use conda to install these after downloading and extracting the appropriate zip file. From the LinuxArtifacts or OSXArtifacts directories:

conda install -c packages <package name>

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Docker image(s) built (images are in the LinuxArtifacts zip file above):

Package	Tag	Install with docker
gfa1	0.53.alpha--h7132678_0	show gzip -dc LinuxArtifacts/images/gfa1:0.53.alpha--h7132678_0.tar.gz | docker load

[dpryan79]

@BiocondaBot please merge

[BiocondaBot]

I will attempt to upload artifacts and merge this PR. This may take some time, please have patience.