ejabberd_observer_cli: Bump observer_cli version to 1.8.6

Author: badlop

ejabberd_observer_cli/rebar.config

@@ -1,5 +1,5 @@
 {deps, [
-        {observer_cli, "1.8.5", {git, "https://github.com/zhongwencool/observer_cli"}},
+        {observer_cli, "1.8.6", {git, "https://github.com/zhongwencool/observer_cli"}},
         {os_stats, ".*", {git, "https://github.com/zhongwencool/os_stats"}},
         {recon, "2.5.6", {git, "https://github.com/ferd/recon"}}
        ]}.