Prepare to release 1.3.0-beta.2

Author: Xin Gao

src/MicrosoftTeams.ts

@@ -19,7 +19,7 @@ interface Window {
 namespace microsoftTeams {
   "use strict";
 
-  const version = "1.2";
+  const version = "1.3.0-beta.2";
 
   const validOrigins = [
     "https://teams.microsoft.com",

test/MicrosoftTeams.spec.ts

@@ -129,7 +129,7 @@ describe("MicrosoftTeams", () => {
     expect(initMessage.id).toBe(0);
     expect(initMessage.func).toBe("initialize");
     expect(initMessage.args.length).toEqual(1);
-    expect(initMessage.args[0]).toEqual("1.2");
+    expect(initMessage.args[0]).toEqual("1.3.0-beta.2");
   });
 
   it("should allow multiple initialize calls", () => {