add suggestions for print/write with newline lint

[euclio]

changelog: Add machine-applicable suggestions for print!/write! with newline lints.

[mati865]

CI error:

error: this argument is passed by reference, but would be more efficient if passed by value
   --> clippy_lints/src/write.rs:276:43
    |
276 | fn newline_span(fmt_str: &str, str_style: &StrStyle, sp: Span) -> Span {
    |                                           ^^^^^^^^^ help: consider passing by value instead: `StrStyle`
    |
    = note: `-D clippy::trivially-copy-pass-by-ref` implied by `-D clippy::all`
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
error: aborting due to previous error

[euclio]

@mati865 Fixed.

[flip1995]

This LGTM over all.

[euclio]

@flip1995 Friendly ping. Anything else I need to take care of?

[flip1995]

Thanks for the ping! Totally forgot about this, sorry.

@bors r+

[bors]

📌 Commit 2d0c797 has been approved by flip1995

[bors]

⌛ Testing commit 2d0c797 with merge 5be4e71...

[bors]

☀️ Test successful - checks-travis, status-appveyor
Approved by: flip1995
Pushing 5be4e71 to master...