Changed/Fixed test_post_details(_v3)

[Thamos]

As mentioned in https://github.com/nborrmann/jodel_api/pull/41 "test_post_details" doesn't work anymore.

I removed the failing part and recreated the tested functionality (check if the actual replies equal the number in the "child_count" variable) in test_post_details_v3. Sometimes this still fails, I think that happens when someone just commented. That's why I changed it to don't check the most discussed jodel.

I think the old test doesn't work anymore because if there are too many replies they don't get returned with the v2 method. -> Tested it with a 10 reply post and it worked, children array was filled -> Tested it with a > 40 reply post and it didn't work, children array was empty

I've also added the hmac key change in this pull request because otherwise the tests fail anyway.

[codecov-io]

Codecov Report

Merging #42 into master will decrease coverage by 2.75%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   94.88%   92.12%   -2.76%     
==========================================
  Files           6        6              
  Lines         508      508              
==========================================
- Hits          482      468      -14     
- Misses         26       40      +14

Impacted Files	Coverage Δ
src/jodel_api/jodel_api.py	89.23% <100%> (-2.25%)	:arrow_down:
src/jodel_api/gcmhack.py	87.09% <0%> (-7.26%)	:arrow_down:

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