update MockInterface firmwareVersion

app/src/main/java/com/geeksville/mesh/repository/radio/MockInterface.kt

@@ -179,7 +179,7 @@ class MockInterface(private val service: RadioInterfaceService) : Logging, IRadi
                 myInfo = MeshProtos.MyNodeInfo.newBuilder().apply {
                     myNodeNum = MY_NODE
                     messageTimeoutMsec = 5 * 60 * 1000
-                    firmwareVersion = "1.2.8" // Pretend to be running an older 1.2 version
+                    firmwareVersion = "1.3.8" // Pretend to be running an older 1.3 version
                     maxChannels = 8
                 }.build()
             },