docs: remove CodeFund sponsor

[andrewmcodes]

What:

Remove CodeFund sponsor ad from the README

Why:

CodeFund is not allowed to place ads on README's anymore according to GitHub. Please reach out to our team if you have any questions :slightly_smiling_face:

How:

Remove code from the top of the README

Checklist:

• [x] Documentation
• [ ] Tests N/A
• [x] Ready to be merged
• [ ] Added myself to contributors table

[codecov[bot]]

Codecov Report

Merging #30 into master will not change coverage by %. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #30   +/-   ##
=======================================
  Coverage   21.73%   21.73%           
=======================================
  Files           9        9           
  Lines         184      184           
  Branches       28       28           
=======================================
  Hits           40       40           
  Misses        123      123           
  Partials       21       21           

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update b9855d8...7336510. Read the comment docs.