Version 0.5.0

Added

• Visualize individual student assignment scores.
  • This makes it possible to see how a student is doing over time
    and if intervention is needed.
• Optionally filter how many assignments show up in the visualization.
• Link Final Grade Plot with individual student assignment scores.
• Visualize score distributions for each assignment along with mean and median.
• Visualize a comparison between scores from each grader.
• Center chart titles and add more elaborate instructions.
• Show mean and median grade in plot.

Changed

• Require Python 3.8 instead of 3.6 to ensure that importlib.metadata is in stdlib.
• Make saved messages stand out and simplify final info note.
• Make hover highlighting more intuitive and better explained.
• Filter out unpublished assignment and those missing a max score.
• Put assignment titles on top of plots instead of to the left.
• Maintain assignment order from Canvas in all visualizations.
• Only show a sample of the students with unposted assignments.

Fixed

• Make rounding work with dfs containing None instead of NaN
  (happens when all values are None for an assignment and there is no type casting)