Changed function signature from rest.API to rest.Send

[adnrs96]

This PR changes the function signature from API to Send as raised in issue #13 .
This must be able to resolve issue #13 .

[thinkingserious]

Please update the README to reflect the new changes: https://github.com/sendgrid/rest/blob/master/README.md

Please update the example code to reflect the changes: https://github.com/sendgrid/rest/blob/master/examples/example.go

[thinkingserious]

Please update this comment.

[thinkingserious]

Please update this comment

[thinkingserious]

Hi @adnrs96,

This looks great now, thanks!

I will be merging this after we get this one closed.

[thinkingserious]

Hello @adnrs96,

I think that in order to avoid a breaking change, we should leave API as a pass through function to Send. Do you mind making that change?

With Best Regards,

Elmer

[SendGridDX]

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