Add switches to readme

Author: bugadani

espflash/README.md

@@ -36,6 +36,9 @@ OPTIONS:
         --bootloader <BOOTLOADER>
             Path to a binary (.bin) bootloader file
 
+        --dtr <DTR> [only available when built with the "raspberry" feature]
+            DTR pin to use for the internal UART hardware. Uses BCM numbering
+
         --erase-otadata
             Erase the OTADATA partition This is useful when using multiple OTA partitions and still
             wanting to be able to reflash via espflash
@@ -67,6 +70,9 @@ OPTIONS:
         --ram
             Load the application to RAM instead of Flash
 
+        --rts <RTS> [only available when built with the "raspberry" feature]
+            RTS pin to use for the internal UART hardware. Uses BCM numbering
+
     -s, --flash-size <SIZE>
             Flash size of the target [possible values: 256KB, 512KB, 1MB, 2MB, 4MB, 8MB, 16MB, 32MB,
             64MB, 128MB]