Fix first line ending in paragaph after frontmatter

Closes GH-143.

Author: wooorm

src/to_html.rs

@@ -743,6 +743,7 @@ fn on_exit_break(context: &mut CompileContext) {
 
 /// Handle [`Exit`][Kind::Exit]:[`BlankLineEnding`][Name::BlankLineEnding].
 fn on_exit_blank_line_ending(context: &mut CompileContext) {
+    context.slurp_one_line_ending = false;
     if context.index == context.events.len() - 1 {
         context.line_ending_if_needed();
     }

tests/frontmatter.rs

@@ -91,6 +91,12 @@ fn frontmatter() -> Result<(), message::Message> {
         "should support spaces and tabs after closing fence"
     );
 
+    assert_eq!(
+        to_html_with_options("---\n---\na\nb", &frontmatter)?,
+        "<p>a\nb</p>",
+        "should support line endings after frontmatter"
+    );
+
     assert_eq!(
         to_html_with_options("--- a\n---", &frontmatter)?,
         "<h2>--- a</h2>",