making sanitize_mermaid more lenient

eralchemy/models.py

@@ -39,7 +39,7 @@ class Drawable(ABC):
 
 
 def sanitize_mermaid(text: str, *, is_er: bool = False):
-    RE = re.compile("[^0-9a-zA-Z_-]+")
+    RE = re.compile("[^0-9a-zA-Z._-]+")
     """Mermaid does not allow special characters in column names"""
     if not text:
         return text