Ignore resource WARC records for now

[benoit74]

Fix #197

add_items_for_warc_record is already called only for records of type resource, response and revisit (i.e. request records are ignored) due to the filtering logic of iter_warc_records.

The logic to add a real item to the ZIM was not called if record type is revisit, i.e. it was called only for resource and response.

As explained in #197, resource WARC records must not be added as-is to the ZIM, they are not regular web responses (as their WARC type implies).

The logic is hence inverted to also be future-prood:

• apply the default logic to add an item to the ZIM only if record is a response
• apply the logic to compute revisits only if record is a revisit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.12%. Comparing base (6fedf54) to head (8120a1f).
Report is 1 commits behind head on warc2zim2.

Additional details and impacted files

@@              Coverage Diff              @@
##           warc2zim2     #198      +/-   ##
=============================================
- Coverage      86.22%   86.12%   -0.11%     
=============================================
  Files             13       13              
  Lines            973      973              
  Branches         176      176              
=============================================
- Hits             839      838       -1     
- Misses           110      111       +1     
  Partials          24       24              

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[rgaudin]

LGTM