Fix visual studio's complaining

src/Discord.Net/Rest/Entities/Roles/Role.cs

@@ -65,12 +65,17 @@ namespace Discord
             else return Equals(otherAsRole);
         }
 
-        public bool Equals(Role other)
+        public bool Equals(IRole other)
         {
             if (other == null) return false;
             else return (Id.Equals(other.Id));
         }
 
+        public override int GetHashCode()
+        {
+            return base.GetHashCode();
+        }
+
         public Role Clone() => MemberwiseClone() as Role;
         
         public override string ToString() => Name;