New version: Matroids v0.0.8

[JuliaRegistrator]

• Registering package: Matroids
• Repository: https://github.com/scheinerman/Matroids.jl
• Created by: @scheinerman
• Version: v0.0.8
• Commit: 8e55f4eeba955fb989032fe42365259f9fc13e75
• Reviewed by: @scheinerman
• Reference: Register 0.0.8 scheinerman/Matroids.jl#9 (comment)
• Description: Matroids for Julia
• Release notes:

## Breaking Changes
* Nothing broken, but added `closure` and `isflat`, plus function docs.

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