remove old unused headers

packages/rocketchat-cors/cors.coffee

@@ -29,8 +29,6 @@ WebApp.rawConnectHandlers.use (req, res, next) ->
 
 WebApp.rawConnectHandlers.use (req, res, next) ->
 	res.setHeader("Access-Control-Allow-Origin", "*")
-	res.setHeader("X-Rocket-Chat-Version", RocketChat.Info.version)
-	res.setHeader("Access-Control-Expose-Headers",  "X-Rocket-Chat-Version")
 
 	# Block next handlers to override CORS with value http://meteor.local
 	setHeader = res.setHeader
@@ -44,8 +42,6 @@ WebApp.rawConnectHandlers.use (req, res, next) ->
 _staticFilesMiddleware = WebAppInternals.staticFilesMiddleware
 WebAppInternals._staticFilesMiddleware = (staticFiles, req, res, next) ->
 	res.setHeader("Access-Control-Allow-Origin", "*")
-	res.setHeader("X-Rocket-Chat-Version", RocketChat.Info.version)
-	res.setHeader("Access-Control-Expose-Headers",  "X-Rocket-Chat-Version")
 	_staticFilesMiddleware(staticFiles, req, res, next)