Julia v1.7.0, \ and newline on Windows

Julia 1.7.0-beta2 allows \ to remove the newline as in

```
txt = "This is a long \
line"
println(txt)
```
to print as
`This is a long line`

Nice, but this does not work with the Windows standard `\r\n`. I guess this could easily lead to mix-ups when moving code across platforms.