Add incremental backoff

[andrewsayre]

Description:

Adds incremental backoff logic to the reconnection task, with a ceiling of 10min. This also means that the maximum reconnect delay can be 10min.

Related issue (if applicable): fixes #77

Checklist:

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• Tests have been added/updated. No exclusions in .coveragerc permitted.
• README.MD updated (if necessary)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.76%. Comparing base (1938cb0) to head (ee07f16).

Files with missing lines	Patch %	Lines
pyheos/connection.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              dev      #78   +/-   ##
=======================================
  Coverage   99.76%   99.76%           
=======================================
  Files          19       19           
  Lines        2118     2122    +4     
=======================================
+ Hits         2113     2117    +4     
  Misses          5        5           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.