Fix Incorrect spacing for Add Appointment command result

[gycgabriel]

Close #62.

[codecov-commenter]

Codecov Report

Merging #71 (3d890d3) into master (98ee04f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #71   +/-   ##
=========================================
  Coverage     64.27%   64.27%           
  Complexity      418      418           
=========================================
  Files            83       83           
  Lines          1475     1475           
  Branches        152      152           
=========================================
  Hits            948      948           
  Misses          484      484           
  Partials         43       43           

Impacted Files	Coverage Δ
.../address/logic/commands/AddAppointmentCommand.java	0.00% <ø> (ø)

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[joshenx]

lgtm ty

[didymental]

@gycgabriel think can add a space here from #62 raised by @joshenx

[gycgabriel]

Thanks for pointing out, new PR created.