Refactor Channel Rejoins

[dsrees]

• Rejoin channels whenever a socket opens

[codecov-io]

Codecov Report

Merging #63 into master will increase coverage by 0.08%.
The diff coverage is 77.77%.

@@             Coverage Diff              @@
##             master      #63      +/-   ##
============================================
+ Coverage     91.23%   91.32%   +0.08%     
+ Complexity      179      177       -2     
============================================
  Files             9        9              
  Lines           525      530       +5     
  Branches         69       71       +2     
============================================
+ Hits            479      484       +5     
+ Misses           14       13       -1     
- Partials         32       33       +1

Impacted Files	Coverage Δ	Complexity Δ
src/main/kotlin/org/phoenixframework/Defaults.kt	100% <ø> (+9.09%)	4 <0> (-1)	⬇️
src/main/kotlin/org/phoenixframework/Channel.kt	94.96% <77.77%> (-1.09%)	53 <1> (-1)
src/main/kotlin/org/phoenixframework/Socket.kt	92.59% <0%> (+0.61%)	70% <0%> (ø)	⬇️

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