Minor edits

[sepandhaghighi]

Reference Issues/PRs

What does this implement/fix? Explain your changes.

• Anaconda badge added to README.md
• Some refactoring in NavaThread
• CHANGELOG.md updated
• README.md updated

Any other comments?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 95.80%. Comparing base (ec72563) to head (eef792e).

Files	Patch %	Lines
nava/thread.py	94.11%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##              dev      #41   +/-   ##
=======================================
  Coverage   95.80%   95.80%           
=======================================
  Files           4        4           
  Lines         143      143           
  Branches       18       18           
=======================================
  Hits          137      137           
  Misses          2        2           
  Partials        4        4           

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