Update history to reflect merge of jekyll#8527 [ci skip]

jekyllbot · jekyllbot · commit ed952e1ca055 · 2021-01-01T11:29:28.000-05:00
diff --git a/History.markdown b/History.markdown
@@ -5,6 +5,7 @@
   * typo - do instead of don&#39;t (#8518)
   * Document support for TSV files consistently (#8488)
   * Add a disclaimer to tutorials involving Ruby code (#8525)
+  * Improve documentation on developing generators (#8527)
 
 ## 4.2.0 / 2020-12-14
 
