Remove invalid `protocol` option from SSLOpts passed to ssl:connect/2
Remove invalid `protocol` option from SSLOpts passed to ssl:connect/2

Thanks to Brett Holton for pointing this out in issue #9.
Tested with R16B01 and R15B03.

woowinc/escalus,sameroom/escalus,Nyco/escalus,wcy123/escalus,esl/escalus