Merge pull request #69 from launchbadge/ab/pg-tls-fix

PgConnection: clear buffers after TLS upgrade

sqlx-core/src/postgres/connection.rs

@@ -389,6 +389,8 @@ impl PgConnection {
             _ => return Err(tls_err!("unknown `sslmode` value: {:?}", ssl_mode).into()),
         }
 
+        self_.stream.clear_bufs();
+
         self_.startup(&url).await?;
 
         Ok(self_)