Update maps.rs

added missing = from base64 charset. It was missing because not technically official part of charset, only used in padding, we use it in mapping.

src/char_mappings/maps.rs

@@ -66,6 +66,7 @@
         '9' => Some((239, 197, 183)),
         '/' => Some((199, 187, 241)),
         '+' => Some((195, 216, 223)),
+        '=' => Some((193, 211, 184)),
         _ => None,
       }
     }
@@ -135,6 +136,7 @@
         ((239, 197, 183), '9'),
         ((199, 187, 241), '/'),
         ((195, 216, 223), '+'),
+        ((193, 211, 184), '='),
       ]
       .iter()
       .cloned()