AP_RangeFinder: update minimum fw version of TFMiniPlus

Version 2.0.3 has important fixes to avoid having the sensor to lock up.
Let's make sure we check for it and warn on console.

libraries/AP_RangeFinder/AP_RangeFinder_Benewake_TFMiniPlus.cpp

@@ -99,8 +99,8 @@ bool AP_RangeFinder_Benewake_TFMiniPlus::init()
         goto fail;
     }
 
-    if (val[5] * 10000 + val[4] * 100 + val[3] < 10706) {
-        hal.console->printf(DRIVER ": minimum required FW version 1.7.6, but version %u.%u.%u found\n",
+    if (val[5] * 10000 + val[4] * 100 + val[3] < 20003) {
+        hal.console->printf(DRIVER ": minimum required FW version 2.0.3, but version %u.%u.%u found\n",
                             val[5], val[4], val[3]);
         goto fail;
     }