fix: join array props

[benjamincanac]

Resolves #247.

Fix array props rendering of JSON AST to HTML.

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (dev@4901648). Click here to learn what that means.
The diff coverage is n/a.

@@          Coverage Diff           @@
##             dev     #248   +/-   ##
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  Coverage       ?   89.46%           
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  Files          ?       15           
  Lines          ?      541           
  Branches       ?      111           
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  Hits           ?      484           
  Misses         ?       50           
  Partials       ?        7           

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