Changed dev subscription link to go link

README.md

@@ -9,7 +9,7 @@ To use the Microsoft Graph Excel REST API ASP.NET to-do list sample, you need th
 * Visual Studio 2015 installed and working on your development computer. 
 
      > Note: This sample is written using Visual Studio 2015. If you're using Visual Studio 2013, make sure to change the compiler language version to 5 in the Web.config file:  **compilerOptions="/langversion:5**
-* A Microsoft Office 365 account. You can sign up for [an Office 365 Developer subscription](https://profile.microsoft.com/RegSysProfileCenter/wizardnp.aspx?wizid=14b845d0-938c-45af-b061-f798fbb4d170&lcid=1033) that includes the resources that you need to start building apps.
+* A Microsoft Office 365 account. You can sign up for [an Office 365 Developer subscription](https://aka.ms/devprogramsignup) that includes the resources that you need to start building apps.
 
      > Note: If you already have a subscription, the previous link sends you to a page with the message *Sorry, you can’t add that to your current account*. In that case, use an account from your current Office 365 subscription.
 * A Microsoft Azure Tenant to register your application. Azure Active Directory (AD) provides identity services that applications use for authentication and authorization. A trial subscription can be acquired here: [Microsoft Azure](https://account.windowsazure.com/SignUp).