Update uml diagram

[joelgoh1]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 81.50943% with 49 lines in your changes are missing coverage. Please review.

Project coverage is 75.63%. Comparing base (305fe23) to head (9eca23e).

Files	Patch %	Lines
...c/main/java/seedu/address/ui/StudentListPanel.java	0.00%	12 Missing ⚠️
.../java/seedu/address/model/util/SampleDataUtil.java	10.00%	9 Missing ⚠️
src/main/java/seedu/address/ui/StudentCard.java	0.00%	9 Missing ⚠️
...seedu/address/model/student/UniqueStudentList.java	86.95%	4 Missing and 2 partials ⚠️
.../java/seedu/address/model/timeslots/Timeslots.java	71.42%	2 Missing and 2 partials ⚠️
src/main/java/seedu/address/ui/MainWindow.java	0.00%	3 Missing ⚠️
...main/java/seedu/address/model/student/Student.java	88.88%	1 Missing and 1 partial ⚠️
...java/seedu/address/logic/commands/EditCommand.java	97.29%	0 Missing and 1 partial ⚠️
.../seedu/address/logic/parser/EditCommandParser.java	92.85%	0 Missing and 1 partial ⚠️
...in/java/seedu/address/logic/parser/ParserUtil.java	90.90%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #55      +/-   ##
============================================
+ Coverage     75.15%   75.63%   +0.47%     
- Complexity      435      437       +2     
============================================
  Files            73       73              
  Lines          1413     1416       +3     
  Branches        137      138       +1     
============================================
+ Hits           1062     1071       +9     
+ Misses          314      308       -6     
  Partials         37       37              

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[amanzainal]

LGTM!