Fix links in table of contents

[arjunnn]

• Updated links in table of contents
• Added link to Contributors section
• Added link to Usage section
• Renamed Version to Changelog

[codecov-io]

Codecov Report

Merging #11 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #11   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         134    134           
=====================================
  Hits          134    134

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[nirum]

Thanks!!