New version: Matroids v0.0.9

[JuliaRegistrator]

• Registering package: Matroids
• Repository: https://github.com/scheinerman/Matroids.jl
• Created by: @scheinerman
• Version: v0.0.9
• Commit: c494c3d9260a4c837cad503cc51a30bf7630d02d
• Reviewed by: @scheinerman
• Reference: Final pre-release: Register 0.0.9 scheinerman/Matroids.jl#10
• Description: Matroids for Julia
• Release notes:

## Breaking Changes
* Nothing broken. Some minor documentation updates.
* I expect this to be the final 0.0.x release and don't plan to change things for 0.1.0.
* If all goes well, 0.1.0 will be announced on [Julia Discourse](https://discourse.julialang.org/).

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