feat(timeout):

implement (class-bound, instance-bound, request-bound) session timeout
for requests. fix docs config, fix aiohttp session docs links.

mkdocs.yml

@@ -35,6 +35,7 @@ markdown_extensions:
   - pymdownx.inlinehilite
   - markdown_include.include:
       base_path: docs
+  - attr_list
 
 nav:
   - index.md