fix typo

Author: NHDaly

test/corelogging.jl

@@ -114,7 +114,7 @@ end
         @test only(collect_test_logs(logmsg)[1]).kwargs[:x] === "the y"
     end
 end
-@testset "Log message handle_message exception handling"
+@testset "Log message handle_message exception handling" begin
     function capture_stderr(func)
         fname = tempname()
         f = open(fname, "w")