Update changelog for v2.7.4 release

Jeremy Wiebe · Jeremy Wiebe · commit cdfa92866ce7 · 2017-02-02T14:29:59.000-08:00
diff --git a/CHANGELOG b/CHANGELOG
@@ -1,6 +1,5 @@
-# To Be Released
+2.7.4 (February 2, 2017)
     - Add new classname prefixes to CSS documentation: `pw-` and `qa-`
-2.7.4
     - Add links to alternative CSSComb text editor plugins
 2.7.3
     - Temporarily disable `spaced-comment` errors, until Astro release builds comply with this rule.
