👌 IMPROVE: Make NestedTokens.closing not optional

[hukkin]

It seems NestedTokens represents a _open token and _close token pair and the tokens in the stream between them. I think closing token should not be optional?

[codecov]

Codecov Report

Merging #118 (0f49cd7) into master (2afb7cc) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
- Coverage   96.42%   96.38%   -0.04%     
==========================================
  Files          69       69              
  Lines        2934     2932       -2     
==========================================
- Hits         2829     2826       -3     
- Misses        105      106       +1     

Flag	Coverage Δ
pytests	96.38% <100.00%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
markdown_it/token.py	91.76% <100.00%> (ø)
markdown_it/cli/parse.py	85.41% <0.00%> (-2.59%)	⬇️
markdown_it/rules_block/table.py	98.51% <0.00%> (-0.03%)	⬇️
markdown_it/rules_block/blockquote.py	100.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2afb7cc...6dc041b. Read the comment docs.