update to add tests

datastores/sql/postgres/dialect.go

@@ -1,6 +1,12 @@
 package postgres
 
-import "fmt"
+import (
+	"fmt"
+
+	"git.nonahob.net/jacob/golibs/datastores/sql/migrate"
+)
+
+var _ migrate.Dialect = Dialect{}
 
 // Dialect implements migrate.Dialect for PostgreSQL.
 type Dialect struct{}