Updated logo with corrected geometry
Updated logo with corrected geometry

When I posted the original three logo suggestions in
https://github.com/fscheck/FsCheck/issues/219 I'd made the error of not
cutting along the exact lines of the underlying isometric triangles.

While I corrected this error in later suggestions, I never went back to
my original posts and changed them. This is the corrected version of the
chosen design.

fscheck/FsCheck,fscheck/FsCheck,ploeh/FsCheck,fsharp/FsCheck