closes #476 - Notify chatroom when someone receives a star

[anthonykhoa]

closes #476

Version 1 of c0d3 had it such that whenever someone received a star for a lesson module, a notification would appear in that lesson module's chatroom(for example js0 chatroom)

Currently, our setStar resolver(which handles making a request to the database to give a user a star) does not notify the chatroom

This PR will

• Update the setStar graphql resolver to notify chatroom when star has been received by someone
• Update corresponding testing file

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[codecov]

Codecov Report

Merging #477 (60a1fc4) into master (57aa00e) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #477   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           94        94           
  Lines         1271      1275    +4     
  Branches       266       266           
=========================================
+ Hits          1271      1275    +4     

Impacted Files	Coverage Δ
helpers/controllers/starsController.ts	100.00% <100.00%> (ø)