Allow dd.mm.yyyy date format and others

[amenk]

It would be cool be to be able to specify the date format.

This small patch changes it to dd.mm.yyyy but of course it needs to be made configurable

diff --git a/crates/producer/src/dates.rs b/crates/producer/src/dates.rs
index ed11325..2ce0ec7 100644
--- a/crates/producer/src/dates.rs
+++ b/crates/producer/src/dates.rs
@@ -25,7 +25,7 @@ fn pregenerate_dates() -> Vec<String> {
                 month.to_string()
             };
 
-            results.push(format!("{}{}", date, month))
+            results.push(format!("{}.{}", date, month))
         }
     }
 
@@ -63,7 +63,7 @@ impl Producer for DateProducer {
 
             let next = self.inner.next().unwrap();
 
-            let password = format!("{:04}{:04}", next, self.current).into_bytes();
+            let password = format!("{:04}.{:04}", next, self.current).into_bytes();
             debug!(
                 "Sending {} from DateProducer",
                 String::from_utf8_lossy(&password)