Change ft767gx.c to RIG_STATUS_STABLE

Per Steve Conklin, AI4QR, setting the status to STABLE.

yaesu/ft767gx.c

@@ -253,7 +253,7 @@ const struct rig_caps ft767gx_caps = {
   .mfg_name =         "Yaesu",
   .version =           "0.2",
   .copyright =         "LGPL",
-  .status =            RIG_STATUS_BETA,
+  .status =            RIG_STATUS_STABLE,
   .rig_type =          RIG_TYPE_TRANSCEIVER,
   .ptt_type =          RIG_PTT_RIG,
   .dcd_type =          RIG_DCD_NONE,