Fix requiring no space between comment and property drawer for zeroth section.

src/parser/drawer.rs

@@ -1,5 +1,6 @@
 use nom::branch::alt;
 use nom::bytes::complete::tag;
+use nom::bytes::complete::tag_no_case;
 use nom::bytes::complete::take_while;
 use nom::character::complete::line_ending;
 use nom::character::complete::space0;
@@ -92,7 +93,7 @@ fn drawer_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str,
     start_of_line(context, input)?;
     recognize(tuple((
         space0,
-        tag(":end:"),
+        tag_no_case(":end:"),
         space0,
         alt((line_ending, eof)),
     )))(input)