Multiple lines are joined after sanitizing.

[Pawka]

Go code:

package main

import (
    "fmt"

    "github.com/kennygrant/sanitize"
)

func main() {
    content := `<p>LINE 1<br />
LINE 2<br />
LINE 3</p>`
    fmt.Println(sanitize.HTML(content))
}

Will provide:

LINE 1LINE 2LINE 3

New lines are missing. I can fix this by myself, but want to be sure if you'll merge my PR as latest commit is 1 year old.