sdkconfig: update firmware version

redchenjs · redchenjs · commit f6d2fcd0245b · 2018-05-04T14:54:18.000+08:00
diff --git a/main/Kconfig.projbuild b/main/Kconfig.projbuild
@@ -139,7 +139,7 @@ config LED_PIN
 
 config FIRMWARE_VERSION
     string "Firmware Version"
-    default "v4.1"
+    default "v4.2"
     help
         Set firmware version.
 
