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Added note about ProgressBar changes

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Original file line number	Diff line number	Diff line change
`@@ -46,8 +46,16 @@ you can also set the current progress by calling the`
`46`	`46`
`47`	`47`	`..caution::`
`48`	`48`
`49`		`- The progress bar only works if your platform supports ANSI codes; on other`
`50`		`- platforms, no output is generated.`
	`49`	`+ Prior to version 2.6, the progress bar only works if your platform`
	`50`	`+ supports ANSI codes; on other platforms, no output is generated.`
	`51`	`+`
	`52`	`+..versionadded::2.6`
	`53`	`+ If your platform doesn't support ANSI codes, updates to the progress`
	`54`	`+ bar are added as new lines. To prevent the output from being flooded,`
	`55`	`+ adjust the`
	`56`	+:method:`Symfony\\Component\\Console\\Helper\\ProgressBar::setRedrawFrequency`
	`57`	+ accordingly. By default, when using a ``max``, the redraw frequency
	`58`	+ is set to 10% of your ``max``.
`51`	`59`
`52`	`60`	`If you don't know the number of steps in advance, just omit the steps argument`
`53`	`61`	when creating the:class:`Symfony\\Component\\Console\\Helper\\ProgressBar`

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