Update README links

[ahcorde]

Signed-off-by: ahcorde [email protected]

🦟 Bug fix

Fixes #1532

Summary

Update README links

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #1546 (35688ac) into ign-gazebo6 (b843232) will increase coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           ign-gazebo6    #1546   +/-   ##
============================================
  Coverage        64.00%   64.00%           
============================================
  Files              317      317           
  Lines            25509    25509           
============================================
+ Hits             16327    16328    +1     
+ Misses            9182     9181    -1     

Impacted Files	Coverage Δ
src/EntityComponentManager.cc	89.48% <0.00%> (+0.12%)	⬆️

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