Merge remote-tracking branch 'upstream/MK3' into flashair_display_ip

Firmware/Configuration.h

@@ -16,8 +16,8 @@ extern uint16_t nPrinterType;
 extern PGM_P sPrinterName;
 
 // Firmware version
-#define FW_VERSION "3.8.1"
-#define FW_COMMIT_NR   2869
+#define FW_VERSION "3.9.0"
+#define FW_COMMIT_NR   3175
 // FW_VERSION_UNKNOWN means this is an unofficial build.
 // The firmware should only be checked into github with this symbol.
 #define FW_DEV_VERSION FW_VERSION_UNKNOWN