release: prepare for release 2.4.0

[gen2thomas]

Solved issues and/or description of the change

prepare all for release 2.4.0

Checklist, if this is a PR for release:

• [x] The PR's target branch is 'hybridgroup:release'
• [x] I have adjusted the CHANGELOG.md (or already prepared and will be merged as soon as possible)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 74.06877% with 362 lines in your changes missing coverage. Please review.

Project coverage is 72.39%. Comparing base (474d553) to head (0d700b1). Report is 4 commits behind head on release.

Files with missing lines	Patch %	Lines
drivers/ble/sphero/sphero_ollie_driver.go	59.89%	61 Missing and 16 partials :warning:
drivers/serial/sphero/sphero_driver.go	73.33%	57 Missing and 11 partials :warning:
drivers/serial/megapi/motor_driver.go	0.00%	57 Missing :warning:
drivers/ble/parrot/minidrone_driver.go	79.83%	28 Missing and 21 partials :warning:
drivers/ble/microbit/io_pin_driver.go	75.63%	15 Missing and 14 partials :warning:
drivers/serial/neurosky/mindwave_driver.go	87.20%	7 Missing and 4 partials :warning:
drivers/serial/testutil/testutil.go	57.69%	9 Missing and 2 partials :warning:
drivers/ble/device_information_driver.go	75.00%	5 Missing and 5 partials :warning:
drivers/common/spherocommon/spherocommon.go	41.66%	7 Missing :warning:
drivers/ble/ble_driver.go	86.04%	6 Missing :warning:
... and 12 more

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## release #1094 +/- ## =========================================== + Coverage 72.21% 72.39% +0.17% =========================================== Files 92 115 +23 Lines 7588 8963 +1375 =========================================== + Hits 5480 6489 +1009 - Misses 1513 1795 +282 - Partials 595 679 +84 ```

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