Updated mediawiki/extensions
Project: mediawiki/extensions/Negref  4806a5036cf55f5ca0a509914c057f0a13baffb4

Update extension metadata.
- License blurb
- Author lines
- Link attribute
- Cleanup credit style

Change-Id: I730c113e3fb078ca60c465d3b50fe6d1c2a0da43