Fixes #496 - Allow skipping lines when reading xls/xlsx/csv files

[codecov[bot]]

Codecov Report

Merging #497 (ccd5429) into master (eba2f6f) will increase coverage by 0.08%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #497      +/-   ##
==========================================
+ Coverage   90.69%   90.78%   +0.08%     
==========================================
  Files          28       28              
  Lines        2623     2647      +24     
==========================================
+ Hits         2379     2403      +24     
  Misses        244      244              

Impacted Files	Coverage Δ
src/tablib/formats/_csv.py	100.00% <100.00%> (ø)
src/tablib/formats/_xls.py	85.10% <100.00%> (+0.32%)	:arrow_up:
src/tablib/formats/_xlsx.py	97.00% <100.00%> (+0.06%)	:arrow_up:
tests/test_tablib.py	98.60% <100.00%> (+0.03%)	:arrow_up:

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[claudep]

Thanks for the review!