update DG

[raythx98]

Update DG
Add some test cases

[codecov-io]

Codecov Report

Merging #138 into master will increase coverage by 3.03%.
The diff coverage is 8.33%.

@@             Coverage Diff              @@
##             master     #138      +/-   ##
============================================
+ Coverage     73.09%   76.12%   +3.03%     
- Complexity      723      787      +64     
============================================
  Files           118      118              
  Lines          2241     2245       +4     
  Branches        283      285       +2     
============================================
+ Hits           1638     1709      +71     
+ Misses          531      460      -71     
- Partials         72       76       +4     

Impacted Files	Coverage Δ	Complexity Δ
...seedu/address/logic/commands/AddPersonCommand.java	100.00% <ø> (ø)	8.00 <0.00> (ø)
...eedu/address/logic/commands/SortPersonCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../address/logic/parser/EditPersonCommandParser.java	90.19% <ø> (ø)	22.00 <0.00> (ø)
...in/java/seedu/address/logic/parser/ParserUtil.java	92.40% <0.00%> (-6.25%)	30.00 <0.00> (ø)
.../address/logic/parser/SortPersonCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...java/seedu/address/model/information/Priority.java	66.66% <0.00%> (-13.34%)	10.00 <1.00> (+1.00)	⬇️
...cate/PersonBlacklistContainsKeywordsPredicate.java	100.00% <ø> (+100.00%)	7.00 <0.00> (+7.00)
.../predicate/PersonTagsContainKeywordsPredicate.java	100.00% <ø> (+100.00%)	8.00 <0.00> (+8.00)
...ain/java/seedu/address/logic/parser/CliSyntax.java	94.11% <100.00%> (+0.78%)	1.00 <0.00> (ø)
... and 11 more

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[LeeJoonJie]

LGTM!