added in_nbinclude

[stevengj]

Closes #21, closes #20.

[codecov-commenter]

Codecov Report

Merging #24 (0eed5ee) into master (34e8166) will increase coverage by 0.54%.
The diff coverage is 100.00%.

❗ Current head 0eed5ee differs from pull request most recent head e8b6c19. Consider uploading reports for the commit e8b6c19 to get more accurate results

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   86.95%   87.50%   +0.54%     
==========================================
  Files           1        1              
  Lines          46       48       +2     
==========================================
+ Hits           40       42       +2     
  Misses          6        6              

Impacted Files	Coverage Δ
src/NBInclude.jl	87.50% <100.00%> (+0.54%)	⬆️

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