Add function hook_url for URL transfer

Author: flashcode

.github/pull_request_template.md

@@ -35,7 +35,7 @@
 - [ ] Comment in script with name/pseudo, e-mail and license
 - [ ] Only English in code/comments
 - [ ] Pure WeeChat API used, no extra API
-- [ ] Function `hook_process` is used for any blocking call
+- [ ] Function `hook_url`, `hook_process` or `hook_process_hashtable` is used for any blocking call
 - [ ] For Python script: works with Python 3 (Python 2 support is optional)
 - [ ] Score 100 / 100 displayed by [weechat-script-lint](https://github.com/weechat/weechat-script-lint)
 

Contributing.md

@@ -38,7 +38,7 @@ New scripts are added with pull requests against master branch of this repositor
   - consider using [Semantic versioning ](https://semver.org/) (recommended, not mandatory); only digits and dots are allowed in version
   - use only English for code and comments
   - do **NOT** use an extra API between WeeChat and your script (like Ruby gem "WeeChat"), use the standard WeeChat API only
-  - use function [hook_process](https://weechat.org/files/doc/stable/weechat_plugin_api.en.html#_hook_process) or [hook_process_hashtable](https://weechat.org/files/doc/stable/weechat_plugin_api.en.html#_hook_process_hashtable) if your script is doing something blocking (like fetching URL), to not block WeeChat
+  - use function [hook_url](https://weechat.org/files/doc/stable/weechat_plugin_api.en.html#_hook_url) (WeeChat ≥ 4.1.0), [hook_process](https://weechat.org/files/doc/stable/weechat_plugin_api.en.html#_hook_process) or [hook_process_hashtable](https://weechat.org/files/doc/stable/weechat_plugin_api.en.html#_hook_process_hashtable) if your script is doing something blocking (like fetching URL), to not block WeeChat
   - make your Python script compatible with Python 3.x, the support of Python 2.x is now optional
   - use the official WeeChat URL: [https://weechat.org](https://weechat.org) (`https` and no `www.`) in any link to the WeeChat website.