@glyph:  fair enough.  Here's a solution: 
1.  Replace the current notice with:  "The works in this repository are copyrighted by various authors, all of whom have contributed their work under the following license: <FULL TEXT OF MIT LICENSE>"

2.  If the project likes, create a separate THANKS file stating: "We hereby thank the following contributors who have given substantial code to this project and/or to Twisted: <LIST OF NAMES>."