Update freemodbus package.json

Author: Rbb666

iot/freemodbus/package.json

@@ -14,20 +14,14 @@
     "github": "Guozhanxin"
   },
   "license": "BSD",
-  "repository": "https://github.com/RT-Thread-packages/freemodbus",
+  "repository": "https://github.com/RT-Thread-packages/freemodbus-rtt",
   "icon": "unknown",
-  "homepage": "https://github.com/RT-Thread-packages/freemodbus",
-  "doc": "https://github.com/RT-Thread-packages/freemodbus",
+  "homepage": "https://github.com/RT-Thread-packages/freemodbus-rtt",
+  "doc": "https://github.com/RT-Thread-packages/freemodbus-rtt",
   "site": [
-    {
-      "version": "v1.6.0",
-      "URL": "https://github.com/RT-Thread-packages/freemodbus.git",
-      "filename": "freemodbus-1.6.0.zip",
-      "VER_SHA": "a54fe5fac19db439b15c837eebc377fba2b12fa6"
-    },
     {
       "version": "latest",
-      "URL": "https://github.com/RT-Thread-packages/freemodbus.git",
+      "URL": "https://github.com/RT-Thread-packages/freemodbus-rtt.git",
       "filename": "Null for git package",
       "VER_SHA": "master"
     }