Update information about paid GitHub plans

The language here is outdated, as GitHub now offers unlimited private repositories with all paid plans.

Author: brotherben

book/06-github/sections/1-setting-up-account.asc

@@ -14,7 +14,7 @@ Go ahead and do this, it's pretty important (as we'll see later).
 [NOTE]
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 GitHub provides all of its functionality with free accounts, with the limitation that all of your projects are fully public (everyone has read access).
-GitHub's paid plans include a set number of private projects, but we won't be covering those in this book.
+GitHub's paid plans also include the option of creating private projects, but we won't be covering those in this book.
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 Clicking the Octocat logo at the top-left of the screen will take you to your dashboard page.