fix: fix comments detection in Astro front matter (fix #48)

markup_fmt/src/parser.rs

@@ -1027,7 +1027,7 @@ impl<'s> Parser<'s> {
  Some((_, '}')) if matches!(pair_stack.last(), Some('$' | '{')) => {
  pair_stack.pop();
  }
- Some((_, '/')) => {
+ Some((_, '/')) if !matches!(pair_stack.last(), Some('\'' | '"' | '`')) => {
  if let Some((_, c)) = self.chars.next_if(|(_, c)| *c == '/' || *c == '*') {
  pair_stack.push(c);
  }

markup_fmt/tests/fmt/astro/issue-9/7.astro

@@ -0,0 +1,8 @@
+---
+"//"
+'//'
+`//`
+`//${
+ //
+}`
+---

markup_fmt/tests/fmt/astro/issue-9/7.snap

@@ -0,0 +1,11 @@
+---
+source: markup_fmt/tests/fmt.rs
+---
+---
+"//"
+'//'
+`//`
+`//${
+ //
+}`
+---