Fix cargo clippy issues (#407)

Reviewed-on: #407

src/data/totp_key.rs

@@ -1,5 +1,3 @@
-use std::io::ErrorKind;
-
 use base32::Alphabet;
 use rand::Rng;
 use totp_rfc6238::{HashAlgorithm, TotpGenerator};
@@ -90,8 +88,7 @@ impl TotpKey {
 
         let key = match base32::decode(BASE32_ALPHABET, &self.encoded) {
             None => {
-                return Err(Box::new(std::io::Error::new(
-                    ErrorKind::Other,
+                return Err(Box::new(std::io::Error::other(
                     "Failed to decode base32 secret!",
                 )));
             }