Fix organization references in readme

[xiian]

• Changes installation instructions to go with current version of this package
• Changes downloads badge to use current version of this package

Seems that this may have gotten missed when moving to new organization ( 8f8458b , 8db5b04 , etc)

[codecov-io]

Codecov Report

Merging #97 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #97   +/-   ##
=========================================
  Coverage     81.02%   81.02%           
  Complexity      303      303           
=========================================
  Files            29       29           
  Lines           680      680           
=========================================
  Hits            551      551           
  Misses          129      129

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[jcchavezs]

Thanks a lot @xiian! Nice catch!