Expose 'read_only' parameter for 'import_set' and 'import_book'

[dmosberger]

Here is a proposed fix for issue #482.

Fixes #482.

[codecov[bot]]

Codecov Report

Merging #483 (bd18484) into master (e877404) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #483      +/-   ##
==========================================
+ Coverage   90.64%   90.66%   +0.01%     
==========================================
  Files          28       28              
  Lines        2608     2613       +5     
==========================================
+ Hits         2364     2369       +5     
  Misses        244      244              

Impacted Files	Coverage Δ
src/tablib/formats/_xlsx.py	96.80% <100.00%> (ø)
tests/test_tablib.py	98.56% <100.00%> (+<0.01%)	:arrow_up:

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[claudep]

Thanks, it looks good to me! Regarding docs, I would add an entry in HISTORY.md and document the parameter in formats.rst?

[hugovk]

Thank you!