Bugfix/readme

[calvintam236]

What does this PR do?

Fix typos and use relative links in README

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (a fix or feature that would cause existing functionality to change)

Screenshots

If applicable, add screenshots to help explain your problem.

Checklist

• Directed the PR to develop branch and not the master branch
• Wrote additional tests, if needed
• All tests have passed
• I have updated the documentation accordingly, if needed.

[codecov-commenter]

Codecov Report

Merging #120 (baba449) into develop (35dab1e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #120   +/-   ##
========================================
  Coverage    93.93%   93.93%           
========================================
  Files           29       29           
  Lines         1187     1187           
========================================
  Hits          1115     1115           
  Misses          72       72           

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