database/mod.rs -> Method description in "std:error:Error" is deprecated

[manojgop]

File -> database/mod.rs

As per document https://doc.rust-lang.org/std/error/trait.Error.html

fn description(&self) -> &str
This method is soft-deprecated.
Although using it won’t cause compilation warning, new code should use Display instead and new impls can omit it.To obtain error description as a string, use to_string()