Update README.md (openhab#8215)

Added Gardena SILENO city 250 with FW version 1.2 as tested mower
andrewfg · Aug 31, 2020 · afe52cd · afe52cd
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commit afe52cd
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diff --git a/bundles/org.openhab.binding.robonect/README.md b/bundles/org.openhab.binding.robonect/README.md
@@ -19,6 +19,7 @@ Tested mowers
 | Husqvarna Automower 315 | Robonect Hx      | 0.9e, 1.0 preview         |
 | Husqvarna Automower 320 | Robonect Hx      | 1.0 Beta7a                |
 | Husqvarna Automower 420 | Robonect Hx      | 0.9e, 1.0 Beta2           |
+| Gardena SILENO city 250 | Robonect Hx      | 1.2                       |
 
 ## Discovery