Make credits optional.

map_machine/map_configuration.py

@@ -60,6 +60,7 @@ class MapConfiguration:
     use_building_colors: bool = False
     show_overlapped: bool = False
     credit: Optional[str] = "© OpenStreetMap contributors"
+    show_credit: bool = True
 
     @classmethod
     def from_options(

map_machine/mapper.py

@@ -130,7 +130,8 @@ class Map:
                     self.svg, occupied, self.configuration.label_mode
                 )
 
-        self.draw_credits(constructor.flinger.size)
+        if self.configuration.show_credit:
+            self.draw_credits(constructor.flinger.size)
 
     def draw_buildings(self, constructor: Constructor) -> None:
         """Draw buildings: shade, walls, and roof."""