Replace deprecated gems with plugins

Undin · Undin · commit 820345c9c448 · 2019-08-04T02:09:37.000+03:00
diff --git a/_config.yml b/_config.yml
@@ -24,5 +24,5 @@ defaults:
 # Build settings
 markdown: kramdown
 
-gems:
+plugins:
   - jemoji
