refactor(emqx_recon): Use latest version recon

Moved recon dependency from emqx_recon to root

apps/emqx_recon/rebar.config

@@ -1,5 +1,5 @@
 {deps, [
-  {recon, {git, "https://github.com/ferd/recon", {tag, "2.5.0"}}}
+%% recon "https://github.com/ferd/recon" at root rebar.config
 ]}.
 
 {edoc_opts, [{preprocess, true}]}.

rebar.config

@@ -54,6 +54,7 @@
     , {pbkdf2, {git, "https://github.com/emqx/erlang-pbkdf2.git", {branch, "2.0.4"}}}
     , {emqtt, {git, "https://github.com/emqx/emqtt", {tag, "1.2.3"}}}
     , {rulesql, {git, "https://github.com/emqx/rulesql", {tag, "0.1.2"}}}
+    , {recon, {git, "https://github.com/ferd/recon", {tag, "2.5.1"}}}
     , {getopt, "1.0.1"}
     ]}.