pomoxis: switch to base matplotlib

[cjw85]

Switches matplotlib for matplotlib-base

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[cjw85]

@BiocondaBot please fetch artifacts

[BiocondaBot]

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

Arch	Package	Repodata
noarch	pomoxis-0.3.2-py_1.tar.bz2	repodata.json

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You may also use conda to install these:

• For packages on noarch:

conda install -c https://100088-42372094-gh.circle-artifacts.com/0/tmp/artifacts/packages <package name>

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Docker image(s) built:

Package	Tag	Install with docker
pomoxis	0.3.2--py_1	show curl "https://100088-42372094-gh.circle-artifacts.com/0/tmp/artifacts/images/pomoxis%3A0.3.2--py_1.tar.gz" | gzip -dc | docker load

[raivivek]

@bioconda-bot please merge

[BiocondaBot]

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