Fix clippy warnings in examples

Author: akubera

examples/floating-precision.rs

@@ -4,7 +4,7 @@ use bigdecimal::BigDecimal;
 use std::str::FromStr;
 
 fn main() {
-    let input = std::env::args().skip(1).next().unwrap_or("0.7".to_string());
+    let input = std::env::args().nth(1).unwrap_or("0.7".to_string());
     let decimal = BigDecimal::from_str(&input).expect("invalid decimal");
     let floating = f32::from_str(&input).expect("invalid float");
 

examples/simple-math.rs

@@ -21,8 +21,8 @@ sum mut: 48.00000000000000
 fn main() {
     println!("Hello, Big Decimals!");
     let input = "0.8";
-    let dec = BigDecimal::from_str(&input).unwrap();
-    let float = f32::from_str(&input).unwrap();
+    let dec = BigDecimal::from_str(input).unwrap();
+    let float = f32::from_str(input).unwrap();
     println!("Input ({}) with 10 decimals: {} vs {})", input, dec, float);
 
     let bd_square = dec.square();