[fix] Allow missing user_info on Presence channels

[rennokki]

Closes #192

[codecov-commenter]

Codecov Report

Merging #457 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #457      +/-   ##
============================================
+ Coverage     47.36%   47.38%   +0.01%     
  Complexity      284      284              
============================================
  Files            50       50              
  Lines          1119     1127       +8     
============================================
+ Hits            530      534       +4     
- Misses          589      593       +4     

Impacted Files	Coverage Δ	Complexity Δ
src/WebSockets/Channels/PresenceChannel.php	68.18% <100.00%> (ø)	9.00 <0.00> (ø)
src/Console/StartWebSocketServer.php	4.70% <0.00%> (-0.24%)	17.00% <0.00%> (ø%)
src/WebSocketsServiceProvider.php	88.88% <0.00%> (+1.08%)	7.00% <0.00%> (ø%)

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