Add assertions

[mhdsyfq77]

Added assertions to the following classes:

• GuiSettings
• LogsCenter
• LogicManager
• FindCommand
• ModuleCodeContainsKeywordsPredicate

Resolves #91

[Silvernitro]

👍

[yan-soon]

LGTM

[codecov-io]

Codecov Report

Merging #92 into master will decrease coverage by 0.59%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master      #92      +/-   ##
============================================
- Coverage     74.42%   73.83%   -0.60%     
- Complexity      424      428       +4     
============================================
  Files            75       75              
  Lines          1251     1261      +10     
  Branches        125      130       +5     
============================================
  Hits            931      931              
  Misses          273      273              
- Partials         47       57      +10     

Impacted Files	Coverage Δ	Complexity Δ
...n/java/seedu/address/commons/core/GuiSettings.java	62.06% <0.00%> (-7.17%)	6.00 <0.00> (+1.00)	⬇️
...in/java/seedu/address/commons/core/LogsCenter.java	76.31% <0.00%> (-2.07%)	10.00 <0.00> (ø)
...rc/main/java/seedu/address/logic/LogicManager.java	68.18% <0.00%> (-6.82%)	4.00 <0.00> (+1.00)	⬇️
...java/seedu/address/logic/commands/FindCommand.java	81.81% <0.00%> (-18.19%)	7.00 <0.00> (+1.00)	⬇️
...el/module/ModuleCodeContainsKeywordsPredicate.java	77.77% <0.00%> (-22.23%)	8.00 <0.00> (+1.00)	⬇️

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