Add redo command

[bryanyee33]

Closes #113

[codecov]

Codecov Report

Attention: Patch coverage is 96.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 76.38%. Comparing base (8ac2af8) to head (e25201b).

Files	Patch %	Lines
...java/seedu/address/logic/commands/CommandType.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #142      +/-   ##
============================================
+ Coverage     76.11%   76.38%   +0.27%     
- Complexity      450      460      +10     
============================================
  Files            71       72       +1     
  Lines          1436     1457      +21     
  Branches        119      119              
============================================
+ Hits           1093     1113      +20     
- Misses          306      307       +1     
  Partials         37       37              

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