Mark as not for python 2.7.
Summary of upstream release notes, less bugfixes:
* Version 4.1
ESP32-C2: Added flash encryption support
elf2image: Added argument to disable appending SHA256 digests
* Version 4.0
Starting from v4.0.0, esptool adopts the semantic versioning
specification, please read the related "Versions" esptool
documentation page when deciding which version to use.
** Breaking changes
Public API has been defined by limiting access to internals that
have been refactored into multiple source files. Changing or
refactoring these limited internals won't be considered a breaking
change in future releases. Migration is easy and self-explanatory
(you will get an import error if something has moved) and is
required only in projects that import esptool directly.
If active security features are detected, the default behavior
changes to prevent unintentional bricking (#699):
If flash encryption is enabled, erase_flash and erase_region
cannot be executed.
If secure boot is enabled, erase_flash, erase_region and
write_flash operations cannot be performed (write_flash is just
restricted to protect the bootloader region 0x0000->0x8000).
An override flag --force lets the users execute these operations
anyways.
Flash parameters in an image header can now be changed only when no
SHA256 digest is appended (espressif/esp-idf#8798).
Python versions 2.7, 3.4, 3.5, and 3.6 have been deprecated, the
code is now Python 3-only compatible. Releases v4 and later can't be
installed from PyPI on these deprecated Python versions.
The ESP8684 alias has been removed, ESP32-C2 has to be used.
Megabit flash sizes have been deprecated, use megabyte units from
now on.
** New Features
Added stub flasher support for ESP32-C2 ECO1, deprecated ECO0 stub (can still be used with ROM).
espefuse.py: Added a new package - ESP32-D0WDR2-V3
790a9471b7