Release Candidate

In this release, it focused on fix issue #31 .

Thanks to this article with isolate_handler package, I'm able to solve the current issue regarding scheduling bulk notification. Now the app will do the heavy task in separate thread does it doesn't affect in main UI.

Other changes included:

• Add reminder to open app at least once in the beginning of the month.
• Make Notification Setting description clearer.
• Added one thing to hidden debug dialog