Updated README

.clang-uml

@@ -1,8 +1,8 @@
 compilation_database_dir: debug
 output_directory: docs/diagrams
 generate_links:
-  link: "https://github.com/bkryza/clang-uml/blob/{{ git.commit }}/{{ element.source.path }}#L{{ element.source.line }}"
-  tooltip: "{{ element.name }}"
+  link: 'https://github.com/bkryza/clang-uml/blob/{{ git.commit }}/{{ element.source.path }}#L{{ element.source.line }}'
+  tooltip: '{% if "comment" in element %}{{ abbrv(trim(replace(element.comment, "\n+", " ")), 256) }}{% else %}{{ element.name }}{% endif %}'
 diagrams:
   main_package:
     include!: uml/main_package_diagram.yml