Fix dictionary syntax for project_urls

Author: koutoftimer

setup.py

@@ -9,11 +9,11 @@
     author="Scrapy project",
     author_email="[email protected]",
     url="https://github.com/scrapy/w3lib",
-    project_urls=[
+    project_urls={
         "Documentation": "https://w3lib.readthedocs.io/en/latest/",
         "Source Code": "https://github.com/scrapy/w3lib",
         "Issue Tracker": "https://github.com/scrapy/w3lib/issues",
-    ],
+    },
     packages=find_packages(exclude=("tests", "tests.*")),
     package_data={
         "w3lib": ["py.typed"],