Make listenerCount public

[bleroux-orange]

No description provided.

[codecov]

Codecov Report

Merging #18 into develop will increase coverage by 0.26%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop      #18      +/-   ##
===========================================
+ Coverage    94.07%   94.33%   +0.26%     
===========================================
  Files            4        4              
  Lines          304      371      +67     
  Branches         0       26      +26     
===========================================
+ Hits           286      350      +64     
- Misses          18       19       +1     
- Partials         0        2       +2

Impacted Files	Coverage Δ
Sources/Listenable/Listenable.swift	100% <ø> (ø)	⬆️
Sources/Listenable/ListenerNode.swift	100% <0%> (ø)	⬆️
Sources/Listenable/ListenerPriority.swift	100% <0%> (ø)	⬆️
Sources/ListenableTests/ListenableTests.swift	91.76% <0%> (+0.02%)	⬆️

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[msaps]

@bleroux-orange Thanks! 👍