Promote K3 to STABLE

rigs/kenwood/k3.c

@@ -182,7 +182,7 @@ const struct rig_caps k3_caps =
     .mfg_name =     "Elecraft",
     .version =      BACKEND_VER ".0",
     .copyright =        "LGPL",
-    .status =       RIG_STATUS_BETA,
+    .status =       RIG_STATUS_STABLE,
     .rig_type =     RIG_TYPE_TRANSCEIVER,
     .ptt_type =     RIG_PTT_RIG,
     .dcd_type =     RIG_DCD_RIG,