New acceptor SMARTS for halogen bond

[asiomchen]

New default pattern for acceptor in XBAcceptot/XBDonor to recognize also carbonyles (and other species with double or aromatic bonds), as mentioned in #189 , below is the compassion between old and new pattern

[cbouy]

Hi and thanks for raising the issue and submitting a PR 🙌
Will try to review it quickly in the coming days but sounds sensible to me

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.24%. Comparing base (095798d) to head (56758e4).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #190   +/-   ##
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  Coverage   95.24%   95.24%           
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  Files          20       20           
  Lines        1409     1409           
=======================================
  Hits         1342     1342           
  Misses         67       67           

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[cbouy]

Thanks for the contribution @asiomchen !