Remove un-needed bower.json additional file for gurnt release task.

Version in bower.json is now deprecated (https://github.com/bower/spec/blob/master/json.md#version)

.grunt-tasks/release.js

@@ -9,7 +9,6 @@ module.exports = {
 			apiRoot: "https://api.github.com",
 			repo: "nhsevidence/NICE-experience",
 			accessTokenVar: "GITHUB_ACCESS_TOKEN"
-		},
-		additionalFiles: [/*"bower.json"*/]
+		}
 	}
 };