v1.1 - Update GPA scale for 2024-2025 school year

Now uses new GPA scale for the 2024-2025 school year.

v1.0.4 - Add 'I' as 0 GPA

Make an 'I' in a class count as 0 GPA, fixing GPA being "N/A".

v1.0.3 - Use new PowerSchool URL

Update Powerschool URL (#4)

* Update url

* update to match student sign on url

* fix problem with '/' in url

v1.0.2 - fix extension for a Pass class

Extension no longer breaks when you have a grade of Pass in a class that counts for GPA.

v1.0.1 - hotfix for PowerSchool changing class alignment

Fixes extension breaking after PowerSchool changed alignment of classes, thanks @timrolsh