readme: Update for next dev release

Bump version described in README to a development version of the
next release

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

README.md

@@ -18,7 +18,7 @@
 [travis]: https://travis-ci.org/mcu-tools/mcuboot
 [license]: https://github.com/mcu-tools/mcuboot/blob/main/LICENSE
 
-This is MCUboot version 2.2.0
+This is MCUboot version 2.3.0-dev
 
 MCUboot is a secure bootloader for 32-bits microcontrollers. It defines a
 common infrastructure for the bootloader and the system flash layout on

boot/zephyr/VERSION

@@ -1,5 +1,5 @@
 VERSION_MAJOR = 2
-VERSION_MINOR = 1
+VERSION_MINOR = 3
 PATCHLEVEL = 0
 VERSION_TWEAK = 0
 EXTRAVERSION = dev