make crypto swift stop warning for swift 3
make crypto swift stop warning for swift 3

vapor/vapor,mpclarkson/vapor,qutheory/vapor,kdawgwilk/vapor,vapor/vapor,LoganWright/vapor,vapor/vapor,qutheory/vapor,qutheory/vapor,kdawgwilk/vapor,LoganWright/vapor,vapor/vapor,kdawgwilk/vapor