add @test_broken JuliaData/Tables.jl#155

Author: ablaom

test/data_utils.jl

@@ -84,7 +84,7 @@ end
     X = ones(3,2)
     T = table(X)
     @test Tables.istable(T)
-    @test Tables.matrix(T) == X
+    @test_broken Tables.matrix(T) == X
 end
 # ------------------------------------------------------------------------
 @testset "nrows-light" begin