Consider using SweetAlert2 instead of SweetAlert

[limonte]

I would like to propose migrating from SweetAlert to SweetAlert2 - the supported fork of SweetAlert. The original reason for creating SweetAlert2 is the inactivity of SweetAlert: https://stackoverflow.com/a/27842854/1331425

Reasons to switch:

1. More great features like toasts which were requested in #119

2. Accessibility (WAI-ARIA) - SweetAlert2 is fully WAI-ARIA compatible and supports all popular screen-readers. Accessibility is a must in 2019, there are a lot of explanatory and tech articles, but this one is truly inspirable: Software development 450 words per minute

3. Better buttons contrast is a huge advantage for all users especially for users with vision disabilities.

4. Better support, average time to resolve an issue:

   • SweetAlert:
   • SweetAlert2:

5. SweetAlert2 is twice more popular that SweetAlert: https://www.npmtrends.com/sweetalert-vs-sweetalert2

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I can contribute with a PR if needed. After migrating, I can add the link to this project to https://github.com/sweetalert2/sweetalert2#related-community-projects so users can discover it

[uxweb]

Awesome, go ahead!