replace error-chain by anyhow (#152)

src/output/utils.rs

@@ -1,14 +1,7 @@
-use error_chain::error_chain;
+use anyhow::Result;
 use serde::ser::{self, SerializeStruct};
 use std::{fmt, process::Command, result};
 
-error_chain! {
-    foreign_links {
-        Utf8(std::string::FromUtf8Error);
-        Io(std::io::Error);
-    }
-}
-
 pub struct Info(pub String);
 
 impl fmt::Display for Info {