Add image-trace-loader to README

[fandy]

Forgot all the loaders 😉

[codecov]

Codecov Report

Merging #68 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #68   +/-   ##
=======================================
  Coverage   92.89%   92.89%           
=======================================
  Files          13       13           
  Lines         169      169           
  Branches       40       40           
=======================================
  Hits          157      157           
  Misses          9        9           
  Partials        3        3

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[cyrilwanner]

Oh, I also forgot to add it to the table above it.. 😅
Thanks for the notice and for adding it!