Fix a flaky test

It turns out that sometimes the slow log entry has a duration of zero,
so cover for this case too.

src/test/java/redis/clients/jedis/commands/jedis/SlowlogCommandsTest.java

@@ -92,7 +92,7 @@ public void slowlogObjectDetails() {
     Slowlog log = logs.get(0);
     assertThat(log.getId(), Matchers.greaterThan(0L));
     assertThat(log.getTimeStamp(), Matchers.greaterThan(0L));
-    assertThat(log.getExecutionTime(), Matchers.greaterThan(0L));
+    assertThat(log.getExecutionTime(), Matchers.greaterThanOrEqualTo(0L));
     assertEquals(4, log.getArgs().size());
     assertEquals(SafeEncoder.encode(Protocol.Command.CONFIG.getRaw()), log.getArgs().get(0));
     assertEquals(SafeEncoder.encode(Protocol.Keyword.SET.getRaw()), log.getArgs().get(1));