use of deprecated item 'std::error::Error::cause'

[stappersg]

Reporting

warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
  --> src/errors.rs:18:1
   |
18 | / quick_error! {
19 | |     /// Single error when of parsing configuration file
20 | |     ///
21 | |     /// Usually you use `ErrorList` which embeds multiple errors encountered
...  |
64 | |     }
65 | | }
   | |_^
   |
   = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

[stappersg]

Probably fixed by tailhook/quick-error#45 but my current rust skill is not enough to verifiy it. I do hope that reporting this issue (and hinted possible solution) helps others.