Add Myrra EF20 footprint
Used for 74087, 74088, 74089 flyback transformers.
http://myrra.com/wp-content/uploads/2017/09/Datasheet-74087-74088-74089-rev-A.pdf
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Provide a URL to a datasheet for the footprint(s) you are contributing -
An example screenshot image is very helpful -
If there are matching symbol or 3D model pull requests, provide link(s) as appropriate -
Check the output of the Travis automated check scripts - fix any errors as required -
Give a reason behind any intentional library convention rule violation.