Remove unnecessary newline in plugin README

[douenergy]

Tracking issue

None

Why are the changes needed?

Currently, the placement of DuckDB in the README is not consistent with the other plugins.

What changes were proposed in this pull request?

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

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[douenergy]

@pingsutw Please take a look 👀

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b2f3b77) 85.75% compared to head (c11d507) 85.12%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2090      +/-   ##
==========================================
- Coverage   85.75%   85.12%   -0.64%     
==========================================
  Files         313      284      -29     
  Lines       23433    22089    -1344     
  Branches     3511     3511              
==========================================
- Hits        20096    18803    -1293     
+ Misses       2730     2678      -52     
- Partials      607      608       +1     

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