added preview image to julia v matlab post

_posts/2021-08-24-julia-for-matlabbers/julia-for-matlabbers.Rmd

@@ -14,7 +14,7 @@ categories:
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   - Matlab
 creative_commons: CC BY
-# preview: preview.png
+preview: preview.png
 ---
 
 Pluto is a harder format to work this than I initially thought so if the notebook does not show up below you can find it at https://julia.ansonbiggs.com/ or the repository https://gitlab.com/MisterBiggs/julia-for-matlabbers

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