refactor: replace failure

- failure is deprecated
- thiserror for deriving Error impl
- anyhow for highlevel error handling

src/configure/read_url.rs

@@ -1,14 +1,12 @@
 use crate::context::Context;
 
-#[derive(Debug, Fail)]
+#[derive(Debug, thiserror::Error)]
 pub enum Error {
-    #[fail(display = "URL request error")]
-    GetError(#[cause] reqwest::Error),
+    #[error("URL request error")]
+    GetError(#[from] reqwest::Error),
 }
 
-pub type Result<T> = std::result::Result<T, Error>;
-
-pub fn read_url(context: &Context, url: &str) -> Result<String> {
+pub fn read_url(context: &Context, url: &str) -> Result<String, Error> {
     info!(context, "Requesting URL {}", url);
 
     match reqwest::blocking::Client::new()