fix: ensure newline at end of file.

fromtext.py

@@ -2,6 +2,7 @@
 # -*- coding: utf-8 -*-
 
 import os
+import string
 import sys
 import pathlib
 
@@ -31,12 +32,15 @@ def process_line(
     columns = [_sanitize_line(l) for l in columns]
     deckpath = _get_path(target_dir, columns[deck_index])
     columns = [columns[i] for i in columns_indices]
-    slug = ''.join(c for c in columns[0].lower() if c.isalnum() or c == ' ')
+    slug = ''.join(c for c in columns[0].lower() if c in string.ascii_lowercase + string.digits + ' ')
     slug = slug.replace(' ', '-')
     base_filename = deckpath / slug
     for i, c in enumerate(columns):
         with (base_filename.parent / (base_filename.name + f'.{i}.md')).open('w') as fp:
             fp.write(c)
+            if not c.endswith('\n'):
+                fp.write('\n')
+
 
 def main(
         *,