Fix edited person bug for both semesters

[erinmayg]

Fix #170

[codecov-io]

Codecov Report

Merging #172 into master will decrease coverage by 0.20%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #172      +/-   ##
============================================
- Coverage     73.53%   73.32%   -0.21%     
  Complexity      744      744              
============================================
  Files           110      110              
  Lines          2101     2107       +6     
  Branches        254      256       +2     
============================================
  Hits           1545     1545              
- Misses          474      479       +5     
- Partials         82       83       +1     

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/seedu/address/model/AddressBook.java	56.25% <0.00%> (-3.75%)	27.00 <1.00> (ø)

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[justintzuriel]

LGTM