Fix inconsistent newline usage %D

[hexpunk]

• Fix inconsistent newline usage %D
• Update affected unit tests
• Add tests for spy.printf %D text replacement

Purpose (TL;DR) - mandatory

See #1717 for the detailed bug report. This PR should resolve #1717.

How to verify - mandatory

1. Check out this branch
2. npm install
3. Make sure that %D always returns \n as its first character.

const Sinon = require('sinon');
const spy = Sinon.spy();
spy(1, 2, 3);
console.log(spy.printf('%D').charCodeAt(0));  // => 10
spy(4, 5, 6);
console.log(spy.printf('%D').charCodeAt(0));  // => 10

Or just run npm test, which should pass.

Checklist for author

• npm run lint passes
• References to standard library functions are cached.

(That second checklist item isn't really applicable to these changes.)

[mroderick]

Thank you for the PR @jayandcatchfire.

I don't think you need to update package-lock.json for the changes made in the other files. Do you agree?

[hexpunk]

The changes to the lock file were only a consequence of running npm install. But if you'd rather the lock file not be updated as part of this PR, I'll revert it. Give me a few hours and I'll be able to get in front of a computer and make that change.

[hexpunk]

@mroderick The lock file has been reverted.

[mroderick]

This has been published as sinon@4.4.3