Update SE identifier to new standards

src/epub/content.opf

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <package xmlns="http://www.idpf.org/2007/opf" dir="ltr" prefix="se: https://standardebooks.org/vocab/1.0" unique-identifier="uid" version="3.0" xml:lang="en-US">
 	<metadata xmlns:dc="http://purl.org/dc/elements/1.1/">
-		<dc:identifier id="uid">url:https://standardebooks.org/ebooks/charles-darwin/the-origin-of-species</dc:identifier>
+		<dc:identifier id="uid">https://standardebooks.org/ebooks/charles-darwin/the-origin-of-species</dc:identifier>
 		<dc:date>2019-01-15T04:52:30Z</dc:date>
 		<meta property="dcterms:modified">2019-01-15T04:52:30Z</meta>
 		<dc:rights>The source text and artwork in this ebook are believed to be in the United States public domain; that is, they are believed to be free of copyright restrictions in the United States. They may still be copyrighted in other countries, so users located outside of the United States must check their local laws before using this ebook. The creators of, and contributors to, this ebook dedicate their contributions to the worldwide public domain via the terms in the [CC0 1.0 Universal Public Domain Dedication](https://creativecommons.org/publicdomain/zero/1.0/).</dc:rights>

src/epub/css/se.css

@@ -56,6 +56,10 @@ section[epub|type~="colophon"] p + p::before{
 	width: 25%;
 }
 
+section[epub|type~="colophon"] p:nth-last-child(2) time{
+	font-variant: small-caps;
+}
+
 section[epub|type~="colophon"] a{
 	font-variant: small-caps;
 }

src/epub/text/colophon.xhtml

@@ -12,13 +12,13 @@
 				<img alt="The Standard Ebooks logo." src="../images/logo.svg" epub:type="z3998:publisher-logo se:image.color-depth.black-on-transparent"/>
 			</header>
 			<p><i epub:type="se:name.publication.book">The Origin of Species by Means of Natural Selection</i><br/>
-			was published in 1859 by<br/>
+			was published in <time>1859</time> by<br/>
 			<a href="https://en.wikipedia.org/wiki/Charles_Darwin">Charles Darwin</a>.</p>
 			<p>This ebook was produced for<br/>
 			<a href="https://standardebooks.org/">Standard Ebooks</a><br/>
 			by<br/>
 			<a href="https://thegriggs.org/david/">David Grigg</a>,<br/>
-			and is based on a transcription produced in 1999 by<br/>
+			and is based on a transcription produced in <time>1999</time> by<br/>
 			<b epub:type="z3998:personal-name">Sue Asscher</b> and <b epub:type="z3998:personal-name">David Widger</b><br/>
 			for<br/>
 			<a href="https://www.gutenberg.org/ebooks/2009">Project Gutenberg</a><br/>
@@ -26,14 +26,14 @@
 			<a href="https://catalog.hathitrust.org/Record/100424049">HathiTrust Digital Library</a>.</p>
 			<p>The cover page is adapted from<br/>
 			<i epub:type="se:name.visual-art.painting">The Sick Monkey</i>,<br/>
-			a painting completed in 1870 by<br/>
+			a painting completed in <time>1870</time> by<br/>
 			<a href="https://en.wikipedia.org/wiki/Edwin_Landseer">Edwin Landseer</a>.<br/>
 			The cover and title pages feature the<br/>
 			<b epub:type="se:name.visual-art.typeface">League Spartan</b> and <b epub:type="se:name.visual-art.typeface">Sorts Mill Goudy</b><br/>
-			typefaces created in 2014 and 2009 by<br/>
+			typefaces created in <time>2014</time> and <time>2009</time> by<br/>
 			<a href="https://www.theleagueofmoveabletype.com/">The League of Moveable Type</a>.</p>
 			<p>The first edition of this ebook was released on<br/>
-			<b>January 15, 2019, 4:52 <abbr class="eoc">a.m.</abbr></b><br/>
+			<time datetime="2019-01-15T04:52:30Z">January 15, 2019, 4:52 <abbr class="eoc">a.m.</abbr></time><br/>
 			You can check for updates to this ebook, view its revision history, or download it for different ereading systems at<br/>
 			<a href="https://standardebooks.org/ebooks/charles-darwin/the-origin-of-species">standardebooks.org/ebooks/charles-darwin/the-origin-of-species</a>.</p>
 			<p>The volunteer-driven Standard Ebooks project relies on readers like you to submit typos, corrections, and other improvements. Anyone can contribute at <a href="https://standardebooks.org/">standardebooks.org</a>.</p>