Remove Notable Traits section from definitions

Rust 1.47.0 introduced the Notable Traits section that lists information
about types used in code block.  As we only want to display the code
block itself without meta-information, this patch ignores the
notable-traits class when extracting the text from nodes.

CHANGELOG.md

@@ -15,6 +15,7 @@ SPDX-License-Identifier: MIT
 - Add interactive tui viewer that adds support for following links from the
   documentation.
 - Add tests for Rust 1.47.0.
+- Remove Notable Traits section from definitions.
 
 ## v0.3.0 (2020-09-11)
 

src/parser/mod.rs

@@ -186,6 +186,12 @@ fn node_to_text(node: &kuchiki::NodeRef) -> String {
 }
 
 fn push_node_to_text(s: &mut String, node: &kuchiki::NodeRef) {
+    if node.has_class("notable-traits") {
+        // The notable-traits element lists informations about types in a code block.  But we only
+        // want to extract the code, so we skip this element.
+        return;
+    }
+
     let is_docblock = node.has_class("docblock");
 
     let add_newline = if node.is_element(&local_name!("br")) {