chore(ehttpc): update tag of ehttpc

apps/emqx_web_hook/rebar.config

@@ -1,7 +1,7 @@
 {plugins, [rebar3_proper]}.
 
 {deps,
- [{ehttpc, {git, "https://github.com/emqx/ehttpc", {tag, "0.1.0"}}},
+ [{ehttpc, {git, "https://github.com/emqx/ehttpc", {tag, "0.1.1"}}},
   {emqx_rule_engine, {git, "https://github.com/emqx/emqx-rule-engine"}}
  ]}.