#1342 add error if level exceeds

[dolanmiu]

Closes #1342

[codecov-commenter]

Codecov Report

Merging #1345 (2eb0b53) into master (ed8b418) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1345   +/-   ##
=======================================
  Coverage   99.33%   99.33%           
=======================================
  Files         315      315           
  Lines        3626     3630    +4     
  Branches      387      389    +2     
=======================================
+ Hits         3602     3606    +4     
  Misses         23       23           
  Partials        1        1           

Impacted Files	Coverage Δ
src/file/numbering/level.ts	100.00% <100.00%> (ø)
src/file/paragraph/formatting/unordered-list.ts	100.00% <100.00%> (ø)

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[jamesmontalvo3]

It's going to be a couple weeks before I can look at this, but I just wanted to say how much I appreciate how quickly you addressed it. Thanks for such a great project!