V1.3.1 fix addstu same email

[marcustw]

Fix addstu same email

Add test cases for equals in EmailTest and MatriculationTest

[codecov-io]

Codecov Report

Merging #140 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #140      +/-   ##
============================================
- Coverage     73.81%   73.79%   -0.02%     
  Complexity      814      814              
============================================
  Files           125      125              
  Lines          2402     2404       +2     
  Branches        243      245       +2     
============================================
+ Hits           1773     1774       +1     
  Misses          556      556              
- Partials         73       74       +1     

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/atas/model/student/Student.java	97.22% <100.00%> (+0.16%)	18.00 <0.00> (+1.00)
...logic/commands/studentlist/EditStudentCommand.java	95.38% <0.00%> (-1.54%)	12.00% <0.00%> (-1.00%)

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[nweiyue]

LGTM!