Small rejigger of the changelog

Author: ericholscher

CHANGELOG.rst

@@ -1,13 +1,13 @@
 Version 3.12.0
 --------------
 
+:Date: February 18, 2020
+
 This version has two major changes:
 
 * It updates our default docker images to stable=5.0 and latest=6.0.
 * It changes our PR builder domain to `readthedocs.build`
 
-:Date: February 18, 2020
-
 * `@humitos <https://github.com/humitos>`__: Use PUBLIC_DOMAIN_USES_HTTPS for resolver tests (`#6673 <https://github.com/readthedocs/readthedocs.org/pull/6673>`__)
 * `@stsewd <https://github.com/stsewd>`__: Always run CoreTagsTests with http (`#6671 <https://github.com/readthedocs/readthedocs.org/pull/6671>`__)
 * `@ericholscher <https://github.com/ericholscher>`__: Remove old docker settings (`#6670 <https://github.com/readthedocs/readthedocs.org/pull/6670>`__)