[v.1.4.1] Add, Edit and Delete Description

[Jargonx]

closes #202

[codecov-io]

Codecov Report

Merging #230 into master will increase coverage by 0.60%.
The diff coverage is 86.20%.

@@             Coverage Diff              @@
##             master     #230      +/-   ##
============================================
+ Coverage     62.07%   62.68%   +0.60%     
- Complexity      775      802      +27     
============================================
  Files           141      144       +3     
  Lines          3043     3119      +76     
  Branches        428      440      +12     
============================================
+ Hits           1889     1955      +66     
- Misses          972      973       +1     
- Partials        182      191       +9     

Impacted Files	Coverage Δ	Complexity Δ
...ivot/logic/parser/AddDescriptionCommandParser.java	72.72% <ø> (ø)	3.00 <0.00> (ø)
...va/seedu/pivot/logic/parser/EditCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...vot/logic/parser/EditDescriptionCommandParser.java	72.72% <72.72%> (ø)	3.00 <3.00> (?)
.../descriptioncommands/DeleteDescriptionCommand.java	85.71% <85.71%> (ø)	8.00 <8.00> (?)
...ds/descriptioncommands/EditDescriptionCommand.java	87.87% <87.87%> (ø)	10.00 <10.00> (?)
...nds/descriptioncommands/AddDescriptionCommand.java	86.66% <100.00%> (ø)	9.00 <0.00> (?)
.../seedu/pivot/logic/parser/DeleteCommandParser.java	81.25% <100.00%> (+1.25%)	13.00 <0.00> (+1.00)
...main/java/seedu/pivot/logic/parser/ParserUtil.java	69.62% <100.00%> (+2.53%)	20.00 <0.00> (+1.00)
...edu/pivot/model/investigationcase/Description.java	100.00% <100.00%> (ø)	10.00 <5.00> (+4.00)
...main/java/seedu/pivot/storage/JsonAdaptedCase.java	94.56% <100.00%> (-0.18%)	13.00 <0.00> (-1.00)
... and 4 more

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