Horizontal rule tag is not displayed in posts

[Kafkaesqui]

The horizontal rule (hr) tag when used in a post is not displayed by the default theme because of the following declaration in its stylesheet:

hr {
	display: none;
	}

I'm submitting a patch to the default theme's style.css which adds the following declaration (to display hr tags within the post class):

.post hr {
	display: block;
	}

Patches style.css to display hr tags in post content

(In [4567]) Show HRs in posts, fixes #3291