normalize Changelog

[5.0.0] - October 3, 2016

Add normalized sections not already present from https://html.spec.whatwg.org/multipage/.
Move unsorted rules into their respective sections.
Update the summary style in all browsers.
Remove ::placeholder styles due to a bug in Edge.
More explicitly define font resets on form controls.
Remove the optgroup normalization needed by the previous font reset.
Update text-size-adjust documentation  for IE on Windows Phone
Update OS X reference to macOS
Update the semver strategy.

Add the correct font weight for b and strong in Chrome, Edge, and Safari.
Correct inconsistent overflow for hr in Edge and IE.
Correct inconsistent box-sizing for hr in Firefox.
Correct inconsistent text-decoration and border-bottom for abbr[title] in Chrome, Edge, Firefox IE, Opera, and Safari.
Correct inheritance and scaling of font-size for preformatted text.
Correct legend text wrapping not present in Edge and IE.
Remove unnecessary normalization of line-height for input.
Remove unnecessary normalization of color for form controls.
Remove unnecessary box-sizing for input[type="search"] in Chrome, Edge, Firefox, IE, and Safari.
Remove opinionated table resets.
Remove opinionated pre overflow.
Remove selector weight from some input selectors.
Update normalization of border-style for img.
Update normalization of color inheritance for legend.
Update normalization of background-color for mark.
Update normalization of outline for :-moz-focusring removed by a previous normalization in Firefox.
Update opinionated style of outline-width for a:active and a:hover.
Update comments to identify opinionated styles.
Update comments to specify browser/versions affected by all changes.
Update comments to use one voice.