Add project_urls metadata [ci skip] (JuliaPy#291)

Author: tkf

setup.py

@@ -64,6 +64,11 @@ def pyload(path):
         'Programming Language :: Python :: 3.7',
       ],
       url='http://julialang.org',
+      project_urls={
+          "Source": "https://github.com/JuliaPy/pyjulia",
+          "Tracker": "https://github.com/JuliaPy/pyjulia/issues",
+          "Documentation": "https://pyjulia.readthedocs.io",
+      },
       packages=find_packages("src"),
       package_dir={"": "src"},
       package_data={'julia': ['fake-julia/*', "*.jl"]},