primitives - impl Debug for BigNum manually

- fix new `clippy` warning

Author: elpiel

primitives/src/big_num.rs

@@ -1,4 +1,5 @@
 use std::convert::TryFrom;
+use std::fmt;
 use std::iter::Sum;
 use std::ops::{Add, AddAssign, Div, Mul, Sub};
 use std::str::FromStr;
@@ -9,19 +10,7 @@ use num_derive::{Num, NumOps, One, Zero};
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 
 #[derive(
-    Serialize,
-    Deserialize,
-    Debug,
-    Clone,
-    PartialEq,
-    Eq,
-    PartialOrd,
-    Ord,
-    NumOps,
-    One,
-    Zero,
-    Num,
-    Default,
+    Serialize, Deserialize, Clone, PartialEq, Eq, PartialOrd, Ord, NumOps, One, Zero, Num, Default,
 )]
 pub struct BigNum(
     #[serde(
@@ -57,6 +46,14 @@ impl BigNum {
     }
 }
 
+impl fmt::Debug for BigNum {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let radix = 10;
+        let value = self.to_str_radix(radix);
+        write!(f, "BigNum(radix: {}; {})", radix, value)
+    }
+}
+
 impl Integer for BigNum {
     fn div_floor(&self, other: &Self) -> Self {
         self.0.div_floor(&other.0).into()

primitives/src/config.rs

@@ -4,7 +4,6 @@ use lazy_static::lazy_static;
 use serde::{Deserialize, Serialize};
 use serde_hex::{SerHex, StrictPfx};
 use std::fs;
-use toml;
 
 lazy_static! {
     static ref DEVELOPMENT_CONFIG: Config =