fix: use associated constants (#191)

src/ipv4.rs

@@ -540,7 +540,7 @@ mod test {
     fn iterator_v4_huge() {
         let cidr: Ipv4Network = "0/0".parse().unwrap();
         let mut iter = cidr.iter();
-        for i in 0..(u32::max_value() as u64 + 1) {
+        for i in 0..(u32::MAX as u64 + 1) {
             assert_eq!(i as u32, u32::from(iter.next().unwrap()));
         }
         assert_eq!(None, iter.next());

src/ipv6.rs

@@ -129,7 +129,7 @@ impl Ipv6Network {
     /// This can return up to 2^128 addresses, which will take a _long_ time to iterate over.
     pub fn iter(&self) -> Ipv6NetworkIterator {
         let dec = u128::from(self.addr);
-        let max = u128::max_value();
+        let max = u128::MAX;
         let prefix = self.prefix;
 
         let mask = max.checked_shl(u32::from(IPV6_BITS - prefix)).unwrap_or(0);