Automate release

Update CHANGELOG for 3.0.4

Update changelog for 3.0.3

Add changelog

Update firmware version string to 3.0.1

Improve documentation for power source instrument

Implement get_fattime (#160)

* rtc_settime, rtc_gettime functions added

* wrapper funcs, bcd_to_data conversion

* update example using rtc_gettime

Signed-off-by: Hrushi20 <hrushikesh20thegreat@gmail.com>

Document how to enter bootloader mode on the v5

feat: legacy power source and i2c commands

docs update