Add low stocks to update

[AudreyFelicio]

No description provided.

[codecov-io]

Codecov Report

Merging #214 into master will decrease coverage by 0.28%.
The diff coverage is 39.39%.

@@             Coverage Diff              @@
##             master     #214      +/-   ##
============================================
- Coverage     53.79%   53.51%   -0.29%     
- Complexity      661      663       +2     
============================================
  Files           121      121              
  Lines          3032     3061      +29     
  Branches        406      409       +3     
============================================
+ Hits           1631     1638       +7     
- Misses         1269     1288      +19     
- Partials        132      135       +3     

Impacted Files	Coverage Δ	Complexity Δ
...du/stock/logic/parser/SuggestionCommandParser.java	80.47% <ø> (-0.69%)	63.00 <0.00> (-1.00)
...in/java/seedu/stock/model/stock/QuantityAdder.java	25.00% <15.38%> (-12.50%)	3.00 <0.00> (ø)
...main/java/seedu/stock/logic/parser/ParserUtil.java	73.97% <16.66%> (-5.14%)	22.00 <1.00> (+1.00)	⬇️
.../seedu/stock/logic/parser/UpdateCommandParser.java	80.39% <71.42%> (-4.61%)	15.00 <0.00> (+2.00)	⬇️

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[kaichaoang]

LGTM!