Update README.md

[SamFleming]

Fix broken link to CONTRIBUTING.md.

Also update other links to CONTRIBUTING.md for consistency — this is probably up for debate as to which link format is preferred.

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[SamFleming]

Signed CLA

[SamFleming]

/assign @nicksardo

[codecov-io]

Codecov Report

Merging #2439 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2439   +/-   ##
=======================================
  Coverage   41.37%   41.37%           
=======================================
  Files          74       74           
  Lines        5262     5262           
=======================================
  Hits         2177     2177           
  Misses       2789     2789           
  Partials      296      296

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[aledbf]

/approve
/lgtm

[aledbf]

@SamFleming thanks!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, SamFleming

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