fix incorrect folder name for julia-0.6.x

Former-commit-id: ef2c7401e0876f22d2f7762d182cfbcd5a7d9c70

julia-0.6.3/share/julia/test/unicode/UnicodeError.jl

@@ -0,0 +1,9 @@
+# This file is a part of Julia. License is MIT: https://julialang.org/license
+
+@testset "invalid utf8" begin
+    let io = IOBuffer()
+        show(io, UnicodeError(Base.UTF_ERR_SHORT, 1, 10))
+        check = "UnicodeError: invalid UTF-8 sequence starting at index 1 (0xa missing one or more continuation bytes)"
+        @test String(take!(io)) == check
+    end
+end