#87 patch-package and forgot to change one file extension in demo.

Author: shepard8

demo/markdown/20_specifics_slides.md

@@ -475,7 +475,7 @@
 
 ##==##
 
-<!-- .slide: data-background="./assets/images/bg-school.jpg" class="transition" -->
+<!-- .slide: data-background="./assets/images/bg-school.avif" class="transition" -->
 
 # Support for avif format
 

package.json

@@ -44,6 +44,7 @@
         "parallelshell": "3.0.1",
         "sass": "^1.51.0",
         "shelljs": "^0.8.5",
-        "vite": "^3.1.0"
+        "vite": "^3.1.0",
+	"patch-package": "^6.5.1"
     }
 }