update readme

support postgres wire protocol in query layer (roapi#169)

update dependency versions for roapi-http 0.6.0 (roapi#159)

fix json table partition loading (roapi#133)

fix json table partition loading (roapi#133)

update clap to 3.x (roapi#126)

bump datafusion to support order unprojected column (roapi#123)

* bump datafusion to support order unprojected column

* bump version

bump datafusion to support order unprojected column (roapi#123)

* bump datafusion to support order unprojected column

* bump version

change default batch size to 8192 (roapi#112)

change default batch size to 8192 (roapi#112)