use sqlx for migrations

src/entity/gateway/postgres/postgres.rs

@@ -31,8 +31,11 @@ pub struct PostgresGateway {
 
 impl PostgresGateway {
     pub fn new(host: &str, dbname: &str, username: &str, password: &str) -> PostgresGateway {
-        // the postgres dep can be removed once refinery supports sqlx
-        let mut conn = Client::connect(&format!("host='{}' dbname='{}' user='{}' password='{}'", host, dbname, username, password), NoTls).unwrap();
+        let mut conn = refinery::config::Config::new(refinery::config::ConfigDbType::Postgres)
+            .set_db_host(&host)
+            .set_db_user(&username)
+            .set_db_pass(&password)
+            .set_db_name(&dbname);
         embedded::migrations::runner().run(&mut conn).unwrap();
 
         let pool = async_std::task::block_on(async move {