Websocket improvements

[BeatsuDev]

Changes:

• Added exponential backoff with full jitter to reconnection attempts
• Added user_agent
• Added the update() function + more documentation about this
• Improved the connection limit bug (not yet fully fixed)

[codecov-commenter]

Codecov Report

Base: 87.23% // Head: 87.85% // Increases project coverage by +0.62% 🎉

Coverage data is based on head (dc1feec) compared to base (fbd4dce).
Patch coverage: 78.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
+ Coverage   87.23%   87.85%   +0.62%     
==========================================
  Files          32       32              
  Lines         987     1013      +26     
==========================================
+ Hits          861      890      +29     
+ Misses        126      123       -3     

Impacted Files	Coverage Δ
tibber/networking/query_builder.py	90.72% <ø> (+3.97%)	⬆️
tibber/networking/query_executor.py	75.00% <70.83%> (-21.23%)	⬇️
tibber/types/home.py	91.17% <83.33%> (-4.37%)	⬇️
tibber/account.py	90.74% <88.88%> (-6.99%)	⬇️
tibber/exceptions/__init__.py	100.00% <100.00%> (ø)
tibber/exceptions/api.py	100.00% <100.00%> (ø)
tibber/types/live_measurement.py	100.00% <0.00%> (+25.00%)	⬆️

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