Remove warnings running tests

[kenarab]

devtools::install()

test_sql_lib.R:33: warning: sql_lib insert and delete test
Closing open result set, pending rows

test_sql_lib.R:36: warning: sql_lib insert and delete test
Closing open result set, pending rows

test_sql_lib.R:60: warning: sql_lib select, insert and delete with dataframe
Closing open result set, pending rows

test_sql_lib.R:66: warning: sql_lib select, insert and delete with dataframe
Closing open result set, pending rows

test_sql_lib.R:104: warning: retrieveInsert
Closing open result set, pending rows

test_sql_lib.R:113: warning: retrieveInsert
Closing open result set, pending rows

[leobelen]

Solved on 0.1.3.