Readme Changes

[eytan-avisror]

closes #21

• Add slack & version badges
• codecov range change

[codecov]

Codecov Report

Merging #23 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #23   +/-   ##
=======================================
  Coverage   70.94%   70.94%           
=======================================
  Files           5        5           
  Lines         616      616           
=======================================
  Hits          437      437           
  Misses        128      128           
  Partials       51       51

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