fix(pypi): add django package changelogs (#2588)

lib/datasource/pypi.js

@@ -16,6 +16,7 @@ function normalizeName(input) {
 const changelogUrls = {
   'pytest-django':
     'https://pytest-django.readthedocs.io/en/latest/changelog.html#changelog',
+  django: 'https://github.com/django/django/tree/master/docs/releases',
 };
 
 async function getPkgReleases(purl, config = {}) {
@@ -59,6 +60,7 @@ async function getPkgReleases(purl, config = {}) {
     }
     const manualRepositories = {
       mkdocs: 'https://github.com/mkdocs/mkdocs',
+      pillow: 'https://github.com/python-pillow/Pillow',
     };
     dependency.repositoryUrl =
       dependency.repositoryUrl || manualRepositories[depName.toLowerCase()];