Merge pull request #1330 from UncleGrumpy/updating

Add notes to UPDATING.md

Adds notes about not currently suporting STM32 devices with only 512k of flash,
and the just discovered `i2c:write_bytes/2` bug on ESP32 platform.

These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

Author: bettio

UPDATING.md

@@ -13,6 +13,10 @@
 - ESP32: partitioning schema for Elixir flavor is different, so app offset has been changed for
 Elixir images. Make sure to use `0x250000` as offset in your mix.exs or when performing manual
 flashing.
+- ESP32 a bug was discovered in `i2c:write_bytes/2` that has not been fixed yet. Writing bytes
+sequentally using `i2c:write_byte/2` still works as a temporary workaround.
+- STM32 devices with 512k of flash are not supported in this release, due to lack of
+flash space. Support may return in a future release.
 
 ## v0.6.0-beta.1 -> v0.6.0-rc.0