fix: escape quotes within link titles (#6)

Before, link titles that contained quotes would be rendered without
their interior quotes escaped and preprocessing would turn
```md
[link](dest "\"weird title\"")
```
into
```md
[link](dest ""weird title"")
```
resulting in a broken link.

This was due to a bug in `pulldown-cmark-to-cmark` fixed in
Byron/pulldown-cmark-to-cmark#62 and released in
version 11.0.2, so this PR bumps the version requirement.

Cargo.toml

@@ -19,7 +19,7 @@ log = "0.4.0"
 mdbook = { version = "0.4.21", default-features = false }
 once_cell = "1.0.0"
 pulldown-cmark = { version = "0.9.0", default-features = false }
-pulldown-cmark-to-cmark = "11.0.1"
+pulldown-cmark-to-cmark = "11.0.2"
 regex = "1.0.0"
 semver = "1.0.0"
 serde = { version = "1.0.85", features = ["derive"] }

src/lib.rs

@@ -792,6 +792,31 @@ This is an example of a footnote[^note].
         "###);
     }
 
+    #[test]
+    fn link_title_containing_quotes() {
+        let book = MDBook::init()
+            .config(Config::latex())
+            .chapter(Chapter::new(
+                "",
+                r#"
+[link][link-with-description]
+
+[link-with-description]: chapter.md '"foo" (bar)'
+                "#,
+                "chapter.md",
+            ))
+            .build();
+        insta::assert_display_snapshot!(book, @r###"
+        ├─ log output
+        │  INFO mdbook::book: Running the pandoc backend    
+        │  INFO mdbook_pandoc::render: Wrote output to book/latex/output.tex    
+        ├─ latex/output.tex
+        │ \href{chapter.md}{link}
+        ├─ latex/src/chapter.md
+        │ [link](chapter.md "\"foo\" (bar)")
+        "###);
+    }
+
     #[test]
     fn raw_opts() {
         let cfg = r#"