chore: rename EMQ X -> EMQX

Author: HJianBo

README.md

@@ -1,7 +1,7 @@
 
 # emqx-coap
 
-emqx-coap is a CoAP Gateway for EMQ X Broker. It translates CoAP messages into MQTT messages and make it possible to communiate between CoAP clients and MQTT clients.
+emqx-coap is a CoAP Gateway for EMQX Broker. It translates CoAP messages into MQTT messages and make it possible to communiate between CoAP clients and MQTT clients.
 
 ### Client Usage Example
 libcoap is an excellent coap library which has a simple client tool. It is recommended to use libcoap as a coap client.
@@ -250,5 +250,5 @@ Apache License Version 2.0
 Author
 ------
 
-EMQ X Team.
+EMQX Team.
 

src/emqx_coap.app.src

@@ -1,13 +1,13 @@
 {application, emqx_coap,
- [{description, "EMQ X CoAP Gateway"},
+ [{description, "EMQX CoAP Gateway"},
   {vsn, "git"},
   {modules, []},
   {registered, []},
   {applications, [kernel,stdlib,gen_coap]},
   {mod, {emqx_coap_app, []}},
   {env, []},
   {licenses, ["Apache-2.0"]},
-  {maintainers, ["EMQ X Team <[email protected]>"]},
+  {maintainers, ["EMQX Team <[email protected]>"]},
   {links, [{"Homepage", "https://emqx.io/"},
            {"Github", "https://github.com/emqx/emqx-coap"}
           ]}