Update Clear command to use --force tag

[kokerinks]

Closes #10

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 76.00%. Comparing base (3366b10) to head (45242d4).

Files	Patch %	Lines
...ava/seedu/address/logic/commands/ClearCommand.java	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #39      +/-   ##
============================================
+ Coverage     75.86%   76.00%   +0.13%     
- Complexity      426      432       +6     
============================================
  Files            72       73       +1     
  Lines          1351     1363      +12     
  Branches        129      130       +1     
============================================
+ Hits           1025     1036      +11     
  Misses          295      295              
- Partials         31       32       +1     

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[billyhoce]

LGTM!

[kinjalagarwal1810]

Looks good!