ansibulled -> antsibull. (#57)

tests/sanity/extra/changelog.json

@@ -5,6 +5,6 @@
         "changelogs/fragments/"
     ],
     "requirements": [
-        "git+git://github.com/ansible-community/ansibulled.git@pip-installable#egg=ansibulled"
+        "git+git://github.com/ansible-community/antsibull.git@pip-installable#egg=antsibull"
     ]
 }

tests/sanity/extra/changelog.py

@@ -21,7 +21,7 @@ def main():
         if ext not in allowed_extensions:
             print('%s:%d:%d: extension must be one of: %s' % (path, 0, 0, ', '.join(allowed_extensions)))
 
-    cmd = ['ansibulled-changelog', 'lint'] + paths
+    cmd = ['antsibull-changelog', 'lint'] + paths
     subprocess.check_call(cmd)