Fix rolback functionality
Fix rolback functionality

`dev> (rollback)`
currently getting ...
```
SQLException No suitable driver found for MxTiCr0Vcw6m78X3ChEDoHbDk7GxOWf8eQBcJ69imThODU4jIPFkM6UxPZb7aUJtp+GSaumwPnTpDmRSPNrYDaE+yBgr6tdgMKWgoQJ6tkA=
	java.sql.DriverManager.getConnection (DriverManager.java:689)
	java.sql.DriverManager.getConnection (DriverManager.java:270)
	clojure.java.jdbc/get-connection (jdbc.clj:320)
	clojure.java.jdbc/get-connection (jdbc.clj:226)
	clojure.java.jdbc/get-connection (jdbc.clj:281)
	clojure.java.jdbc/get-connection (jdbc.clj:226)
	ragtime.jdbc/get-table-names (jdbc.clj:28)
	ragtime.jdbc/get-table-names (jdbc.clj:25)
	ragtime.jdbc/table-exists? (jdbc.clj:32)
	ragtime.jdbc/table-exists? (jdbc.clj:31)
	ragtime.jdbc/ensure-migrations-table-exists (jdbc.clj:35)
	ragtime.jdbc/ensure-migrations-table-exists (jdbc.clj:34)
nil
```
akvo/akvo-dash,akvo/akvo-lumen,akvo/akvo-dash,akvo/akvo-dash,akvo/akvo-lumen