js-mode: Add new error constructor

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/Error

Author: Amorymeltzer

snippets/js-mode/error

@@ -0,0 +1,5 @@
+# -*- mode: snippet; require-final-newline: nil -*-
+# name: new error
+# key: err
+# --
+new Error(${1:message});