Temporarily switching to sqlisrv 5.5.0preview on AppVeyor
Temporarily switching to sqlisrv 5.5.0preview on AppVeyor

See https://github.com/Microsoft/msphpsql/issues/955

mikeSimonson/dbal,drieschel/dbal,lcobucci/dbal,lcobucci/dbal,doctrine/dbal,mikeSimonson/dbal,doctrine/dbal,BenMorel/dbal,BenMorel/dbal,drieschel/dbal