Register the shipped TableConverter so <table> renders as a markdown table (fixes #38)

[namaserajesh]

Follow-up to my comment on #38 — here is the offered fix as a concrete diff.

The bug

Any post containing an HTML <table> loses all tabular structure in the .md output: league/html-to-markdown's createDefaultEnvironment() registers every converter the library ships except TableConverter (GFM tables are an opt-in extension), so <table> falls through to DefaultConverter, which concatenates cell text with no separators. A 4×3 pricing table arrives as PlanPriceStorageSupportFree$05 GBCommunity… — unrecoverable for the LLM/agent consumers this plugin exists to serve, and tables are among the densest content those consumers can ingest.

Note the root cause is registration, not a missing dependency: the library has shipped TableConverter since 5.0.0 (2021) and already carries the table_pipe_escape / table_caption_side option defaults for it. The fix is one line plus the import.

Verification

We have run exactly this change in production on two WordPress sites since 2026-07-20:

• 32/32 posts with tables on one site and 14/14 on the other now emit valid GFM pipe tables in their .md alternates (headers, row boundaries, and cell separation all preserved).
• Cost: about +1.8% markdown size across those posts.
• No change to posts without tables.

Happy to adjust style/placement to your conventions.