[5.7] Remove trailing newline from hot url

[Quezler]

The hot file created in the public directory by mix ends with a newline.

Which is then passed on to the html, which does not look like that was intended:

▲ current | patch ▼

[ankurk91]

I was about to report this.
Thanks for fixing.

For those who dont know why this is happening -
mix() helper retrieve url from public/hot file, and hot file contents look like

http://localhost:8080/

Notice the new line at end.