Add trailing punctuation setting

example/settings.toml

@@ -12,6 +12,7 @@ landing_page="index.html"
 
 [post]
 accepted_images= ["jpg", "JPG", "png", "PNG"]
+trailing_punctuation = ".,)!?>];:"
 # true = add <p></p> tags to each line.
 tag_paragraphs=true
 # apply <p> tags even if a line contains the following