fix: bell and minute rollover, add test case

[harbingerftw]

fixes #14

I was unsure how much or little you wanted tested, does this work?

[EltonChou]

Recommend removing this part.
So you can check you tests' coverage and design your test cases.

EorzeaEnv/test/test_time.py

Lines 75 to 84 in 34e623e

	et = EorzeaTime()
	et.moon += 13
	et.sun += 33
	et.bell += 26
	et.minute += 65
	et.moon -= 13
	et.sun -= 33
	et.bell -= 26
	et.minute -= 65

[harbingerftw]

I deleted the snippet you suggested, these tests cover all the branches now. does this look good?

[EltonChou]

To ensure the result can be reproduced in future. Please specify timestamp to create EorzeaTime or assign a value to et.moon and et.year

For example,
Tests will be failed when EorzeaTime(timestamp=datetime(2030, 1, 23).timestamp())

[EltonChou]

LGTM
Thanks for you report and PR.