ensure sendgrid-php does not use sslv3

[nquinlan]

PHP automatically tries to use SSLv3 when connecting to SendGrid however that no longer works as we disabled support for SSLv3 due to POODLE this can result is failures. We should ensure we don't try to use SSLv3 with this lib.

[nquinlan]

The following solves the problem, although it's likely not the most elegant solution.

curl_setopt($curl, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1_2);

[nquinlan]

@elbuo8 @eddiezane @kunal732 any chance y'all can look into this?

[eddiezane]

Added it to my list unless someone else gets to it first.

[iansltx]

While I'm here...

Looks like Unirest doesn't support injecting custom curl parameters into its requests. Would be easy enough to add something similar to what they already do here:

https://github.com/Mashape/unirest-php/blob/master/lib/Unirest/Unirest.php#L207

to turn off SSLv3 support.

[nquinlan]

Yeah, probably worth a PR.

[eddiezane]

We do not support sslv3 on the API anymore, so this should no longer be an issue.