Support for local worksheet names and constants (#18)

[felipenoris]

No description provided.

[codecov]

Codecov Report

Merging #19 into master will decrease coverage by 0.92%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
- Coverage   96.19%   95.27%   -0.93%     
==========================================
  Files          11       11              
  Lines         840      888      +48     
==========================================
+ Hits          808      846      +38     
- Misses         32       42      +10

Impacted Files	Coverage Δ
src/structs.jl	100% <ø> (ø)	⬆️
src/worksheet.jl	92% <60%> (-4.37%)	⬇️
src/read.jl	92.59% <84.61%> (-1.73%)	⬇️
src/workbook.jl	97.18% <96%> (-1.1%)	⬇️

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