Fixed ad in the list of compulsory prefixes

[dawg420]

No description provided.

[CedricPei]

ACK.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (8265b2d) 68.89% compared to head (5cb29d4) 68.89%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #256   +/-   ##
=========================================
  Coverage     68.89%   68.89%           
  Complexity      645      645           
=========================================
  Files           106      106           
  Lines          2183     2183           
  Branches        229      229           
=========================================
  Hits           1504     1504           
  Misses          609      609           
  Partials         70       70           

Impacted Files	Coverage Δ
...a/seedu/address/logic/parser/AddCommandParser.java	100.00% <100.00%> (ø)

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