Removed FTPS backups and added FTP backups

+ Reverted to ftp 3.0.1
+ fmt + clippy

src/config/mod.rs

@@ -1,6 +1,6 @@
 mod remote;
 
-use crate::config::remote::{FTPSConfig, SFTPConfig};
+use crate::config::remote::{FTPConfig, SFTPConfig};
 use config::{Config, ConfigError, File};
 use serde::Deserialize;
 use std::path::PathBuf;
@@ -49,7 +49,7 @@ pub struct BackupConfig {
 pub struct RemoteBackupConfig {
     pub backups_to_keep: u64,
     pub sftp: Option<SFTPConfig>,
-    pub ftps: Option<FTPSConfig>,
+    pub ftp: Option<FTPConfig>,
 }
 
 /// Configs