Increase post_write to 20ms for FT710

https://github.com/Hamlib/Hamlib/issues/1235

rigs/yaesu/ft710.c

@@ -137,7 +137,7 @@ const struct rig_caps ft710_caps =
     RIG_MODEL(RIG_MODEL_FT710),
     .model_name =         "FT-710",
     .mfg_name =           "Yaesu",
-    .version =            NEWCAT_VER ".2",
+    .version =            NEWCAT_VER ".3",
     .copyright =          "LGPL",
     .status =             RIG_STATUS_STABLE,
     .rig_type =           RIG_TYPE_TRANSCEIVER,
@@ -151,7 +151,7 @@ const struct rig_caps ft710_caps =
     .serial_parity =      RIG_PARITY_NONE,
     .serial_handshake =   RIG_HANDSHAKE_NONE,
     .write_delay =        0,
-    .post_write_delay =   0,
+    .post_write_delay =   20,
     .timeout =            1000,
     .retry =              3,
     .has_get_func =       FTDX10_FUNCS,