req.socket.setTimeout(Infinity) causes runtime error

```
RangeError: "msecs" argument must be a non-negative finite number
at Object.exports.enroll (timers.js:323:11)
at Socket.setTimeout (net.js:326:12)
at sse (C:\DEV\github\Backbone.EventSource\examples\server\node_modules\connect-sse\index.js:4:16)
at callbacks (C:\DEV\github\Backbone.EventSource\examples\server\node_modules\express\lib\router\index.js:164:37)
at param (C:\DEV\github\Backbone.EventSource\examples\server\node_modules\express\lib\router\index.js:138:11)
at pass (C:\DEV\github\Backbone.EventSource\examples\server\node_modules\express\lib\router\index.js:145:5)
at nextRoute (C:\DEV\github\Backbone.EventSource\examples\server\node_modules\express\lib\router\index.js:100:7)
at callbacks (C:\DEV\github\Backbone.EventSource\examples\server\node_modules\express\lib\router\index.js:167:11)
at C:\DEV\github\Backbone.EventSource\examples\server\server.js:16:3
at callbacks (C:\DEV\github\Backbone.EventSource\examples\server\node_modules\express\lib\router\index.js:164:37)
```
using this instead:

req.socket.setTimeout(Number.MAX_SAFE_INTEGER);