Change Toastr to Toaster

[KasraK2K]

Please read and mark the following check list before creating a pull request (check one with "x"):

• I read and followed the CONTRIBUTING.md guide.
• I read and followed the New Feature Checklist guide.

Short description of what this resolves:

In this pull request, I only fixed one word because I saw in your tutorials that you used Toastr and I changed it to Toaster.