Fix latency_max_ms (#966)

Typo in recording of latency_max_ms (accidentally was setting latency_min_ms).  Its not used currently but should be corrected.

Signed-off-by: @nnv-nick
diff --git a/src/lib/ares_metrics.c b/src/lib/ares_metrics.c
index 13e34de..deb3b7f 100644
--- a/src/lib/ares_metrics.c
+++ b/src/lib/ares_metrics.c
@@ -197,7 +197,7 @@
     }
 
     if (query_ms > server->metrics[i].latency_max_ms) {
-      server->metrics[i].latency_min_ms = query_ms;
+      server->metrics[i].latency_max_ms = query_ms;
     }
 
     server->metrics[i].total_count++;