Tweak for new invocations release tasks

tasks.py

@@ -1,3 +1,5 @@
+from os.path import join
+
 from invocations import docs
 from invocations.testing import test, integration, watch_tests
 from invocations.packaging import release
@@ -13,5 +15,9 @@ ns.configure({
     'packaging': {
         'sign': True,
         'wheel': True,
+        'changelog_file': join(
+            docs.ns.configuration()['sphinx']['source'],
+            'changelog.rst',
+        ),
     },
 })