Fixed crashes when adding a goal deadline

Added proguard-rules.pro to prevent minification of flutter_local_notifications code in release builds, so that the app doesn't crash.

Bug fixes & improvements

v1.3

Release v1.3

Much-needed bug fixes

Lots of bug fixes by @ghaith96. Reminders finally work!

Reminders and things

Goal reminder notifications🔔
An updated icon by Arabi Ishaque✨

Initial release🎉

Title says it all.