update to es2015 and use Array.from

Author: analogrelay

dist/aspnet-validation.js

@@ -464,7 +464,7 @@ export class ValidationService {
      * Scans document for all validation message <span> generated by ASP.NET Core MVC, then tracks them.
      */
     private scanMessages(root: HTMLElement) {
-        let validationMessageElements = Array.prototype.slice.call(root.querySelectorAll<HTMLElement>('[data-valmsg-for]')) as HTMLElement[];
+        let validationMessageElements = Array.from(root.querySelectorAll<HTMLElement>('[data-valmsg-for]')) as HTMLElement[];
 
         // querySelectorAll does not include the root element itself.
         // we could use 'matches', but that's newer than querySelectorAll so we'll keep it simple and compatible.
@@ -796,7 +796,7 @@ export class ValidationService {
      * Scans the entire document for input elements to be validated.
      */
     private scanInputs(root: HTMLElement) {
-        let inputs = Array.prototype.slice.call(root.querySelectorAll<HTMLElement>('[data-val="true"]')) as HTMLElement[];
+        let inputs = Array.from(root.querySelectorAll<HTMLElement>('[data-val="true"]')) as HTMLElement[];
 
         // querySelectorAll does not include the root element itself.
         // we could use 'matches', but that's newer than querySelectorAll so we'll keep it simple and compatible.

dist/aspnet-validation.min.js

@@ -26,7 +26,7 @@
     "lib": [
       "dom",
       "es5",
-      "es2015.promise",
+      "es2015",
       "es2018.promise"
     ]
   },