add 1.5 as unsuppoted version for fallback connection
add 1.5 as unsuppoted version for fallback connection

rstudio/sparklyr,kevinykuo/sparklyr,rstudio/sparklyr,rstudio/sparklyr,kevinykuo/sparklyr,kevinykuo/sparklyr,kevinykuo/sparklyr,rstudio/sparklyr