Update README.md

play-scala-mongodb/README.md

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 This is the Play portion of a [benchmarking test suite](../) comparing a variety of web development platforms.
 
-### JSON Encoding Test
-
-* [JSON test source](app/controllers/Application.scala)
-
 ### Data-Store/Database Mapping Test
 
 * [Database test controller](app/controllers/Application.scala)