update lock file

package-lock.json

@@ -1,11 +1,11 @@
 {
   "name": "reveal.js",
-  "version": "4.3.0",
+  "version": "4.3.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "version": "4.3.0",
+      "version": "4.3.1",
       "license": "MIT",
       "devDependencies": {
         "@babel/core": "^7.14.3",