Resolve "Websocket reconnect should be mentioned in the logged warning"

[btschwertfeger]

• Updating the logged message to notify the users about future recovery of a closed connection.
• "Kraken Cryptocurrency Exchange" -> "Kraken Crypto Asset Exchange"

Closes #387

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.46%. Comparing base (bfd65d5) to head (f9912d4).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #388      +/-   ##
==========================================
- Coverage   87.48%   87.46%   -0.03%     
==========================================
  Files          22       22              
  Lines        1974     1970       -4     
==========================================
- Hits         1727     1723       -4     
  Misses        247      247              

Flag	Coverage Δ
unittests	87.46% <100.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/kraken/futures/websocket/__init__.py	84.44% <100.00%> (-0.18%)	⬇️
src/kraken/spot/websocket/connectors.py	87.00% <100.00%> (-0.15%)	⬇️

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