Ignore Jekyll 4's cache

See https://jekyllrb.com/news/2019/08/20/jekyll-4-0-0-released/#cache-all-the-things- & https://github.com/jekyll/jekyll/releases/tag/v4.0.0 It appears during `make site` & `make serve`.

Ignore Jekyll 4's cache
See https://jekyllrb.com/news/2019/08/20/jekyll-4-0-0-released/#cache-all-the-things- & https://github.com/jekyll/jekyll/releases/tag/v4.0.0 It appears during `make site` & `make serve`.
bd56b2b0 · Katrin Leinweber · François Michonneau · 6d015fe8 · bd56b2b0
Commit bd56b2b0 authored Aug 21, 2019 by Katrin Leinweber Committed by François Michonneau Aug 22, 2019
Hide whitespace changes
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.gitignore .gitignore +1 -0

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--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@
 .DS_Store
 .ipynb_checkpoints
 .sass-cache
+.jekyll-cache/
 __pycache__
 _site
 .Rproj.user