Zijian/edit and delete for lesson

[BobbyZhouZijian]

fixes #16

[codecov-io]

Codecov Report

Merging #202 into master will decrease coverage by 2.30%.
The diff coverage is 10.32%.

@@             Coverage Diff              @@
##             master     #202      +/-   ##
============================================
- Coverage     44.96%   42.65%   -2.31%     
- Complexity      545      547       +2     
============================================
  Files           106      112       +6     
  Lines          2522     2670     +148     
  Branches        344      377      +33     
============================================
+ Hits           1134     1139       +5     
- Misses         1281     1423     +142     
- Partials        107      108       +1     

Impacted Files	Coverage Δ	Complexity Δ
...main/java/seedu/address/commons/core/Messages.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...du/address/logic/commands/DeleteLessonCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...java/seedu/address/logic/commands/FindCommand.java	90.00% <ø> (ø)	5.00 <0.00> (ø)
...eedu/address/logic/commands/FindLessonCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ddress/logic/parser/DeleteLessonCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../address/logic/parser/FindLessonCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...eedu/address/logic/parser/LessonCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../java/seedu/address/logic/parser/PlanusParser.java	65.21% <0.00%> (-2.97%)	11.00 <0.00> (ø)
src/main/java/seedu/address/model/Model.java	66.66% <ø> (ø)	1.00 <0.00> (ø)
...rc/main/java/seedu/address/model/ModelManager.java	63.75% <0.00%> (-1.64%)	24.00 <0.00> (ø)
... and 20 more

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[nuovonatura]

LGTM