Corrected function signature for jsPDF.addPage

As per https://rawgit.com/MrRio/jsPDF/master/docs/jsPDF.html#addPage

types/jspdf/index.d.ts

@@ -2,6 +2,7 @@
 // Project: https://github.com/MrRio/jsPDF
 // Definitions by: Amber Schühmacher <https://github.com/amberjs>
 //                 Kevin Gonnord <https://github.com/lleios>
+//                 Jackie Weng <https://github.com/jemerald>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 declare module 'jspdf' {
@@ -45,7 +46,7 @@ declare module 'jspdf' {
             'getPageInfo'(pageNumberOneBased:number):any;
             'getCurrentPageInfo'():any;
         };
-        addPage(sizes?: number[]):jsPDF;
+        addPage(format?: string | number[], orientation?: 'p'|'portrait'|'l'|'landscape'): jsPDF;
         setPage(n:number):jsPDF;
         insertPage(beforePage:number):jsPDF;
         movePage(targetPage:number, beforePage:number):jsPDF;

types/jspdf/jspdf-tests.ts

@@ -13,6 +13,18 @@ function test_simple_two_page_document() {
     doc.save('Test.pdf');
 }
 
+function test_add_pages_with_different_format() {
+    var doc = new jsPDF();
+    doc.text(20, 20, 'Hello world!');
+    doc.addPage('a5', 'l');
+    doc.text(20, 20, 'Do you like that?');
+    doc.addPage('c6');
+    doc.text(20, 20, 'Do you like that?');
+    doc.addPage([595.28, 841.89]);
+    doc.text(20, 20, 'Do you like that?');
+    doc.save('Test.pdf');
+}
+
 function test_landscape() {
     var doc = new jsPDF('landscape');
     doc.text(20, 20, 'Hello landscape world!');