Fix paths returned by find_tests

[icweaver]

Hey folks, thanks for these awesome updates in v2! I noticed that the new find_tests function seemed to be returning repeated path names for tests in subdirectories, so I made this small change if that's alright.

Before:

subdir/subdir_test" => :(include("./test/subdir/subdir/subdir_test.jl"))
"basic"              => :(include("./test/basic.jl"))

After:

subdir/subdir_test" => :(include("./test/subdir/subdir_test.jl"))
"basic"              => :(include("./test/basic.jl"))

[icweaver]

Ah, windows. Two shakes

[giordano]

Thanks for the PR! Can you please bump the patch number of the version so we can quickly do a new release after this?