switch from failure to anyhow

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

src/client/remote_chunk_reader.rs

@@ -1,7 +1,7 @@
 use std::collections::HashMap;
 use std::sync::Arc;
 
-use failure::*;
+use anyhow::{Error};
 
 use super::BackupReader;
 use crate::backup::{ReadChunk, DataBlob, CryptConfig};