Change the format of the invalidExtension error message

Author: jcxplorer

README.md

@@ -252,7 +252,7 @@ The available message keys and their default values are:
 ```js
 {
   fileNotSelected: "You must select a file to upload",
-  invalidExtension: "File must be a JPEG, PNG, WebP or GIF image"
+  invalidExtension: "File must have one of the following extensions:"
 }
 ```
 

src/messages/index.js

@@ -1,4 +1,4 @@
 module.exports = {
   fileNotSelected: "You must select a file to upload",
-  invalidExtension: "File must be a JPEG, PNG, WebP or GIF image"
+  invalidExtension: "File must have one of the following extensions:"
 };

src/upload/index.js

@@ -46,8 +46,9 @@ module.exports = function (options, start, progress, success, error) {
   }
 
   if (!acceptedExtensions.test(options.element.value)) {
+    var message = messages.invalidExtension + " " + options.acceptedExtensions.join(", ");
     nextTick(function () {
-      error({ id: id, message: messages.invalidExtension });
+      error({ id: id, message: message });
     });
     return ret;
   }