create: show audit command on the next line

[abitrolly]

This makes it easy to copy/paste the command, which needs to be run anyway.

Before.

Warning: Cannot verify integrity of '61668e8218397a60410a66ddbbcf622c00bcb9dcf9bfe482908d45c999e5e253--rquickshare-0.11.2.tar.gz'.
No checksum was provided.
For your reference, the checksum is:
  sha256 "d7ede30aed5c61d34a242588414fc00118aa6c9abca89b66cf7bfe454e753aa3"
Please run `HOMEBREW_NO_INSTALL_FROM_API=1 brew audit --new rquickshare` before submitting, thanks.
Editing /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/r/rquickshare.rb
Warning: Using vim because no editor was set in the environment.
This may change in the future, so we recommend setting EDITOR

After

Warning: Cannot verify integrity of '61668e8218397a60410a66ddbbcf622c00bcb9dcf9bfe482908d45c999e5e253--rquickshare-0.11.2.tar.gz'.
No checksum was provided.
For your reference, the checksum is:
  sha256 "d7ede30aed5c61d34a242588414fc00118aa6c9abca89b66cf7bfe454e753aa3"
Please run the following command before submitting, thanks.
  HOMEBREW_NO_INSTALL_FROM_API=1 brew audit --new xxxxx
Editing /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/x/xxxxx.rb
Warning: Using vim because no editor was set in the environment.
This may change in the future, so we recommend setting EDITOR

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

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[abitrolly]

The Ubuntu failure is unrelated.

[MikeMcQuaid]

Thanks @abitrolly!