Add: 12.0-beta2 announcement (#222)

Co-authored-by: Michael Lutz <[email protected]>

_posts/2021-08-19-openttd-12-0-beta2.md

@@ -0,0 +1,24 @@
+---
+title: OpenTTD 12.0-beta2
+author: TrueBrain
+---
+
+Thanks to your awesome testing, we found one critical bug in 12.0-beta1.
+To quickly address this, we release our second beta of the 12.X release series.
+
+There are only a few fixes in this release, mostly related to network servers.
+Most notably:
+* Connecting with the same client name thrice hangs the server.
+* Reusing of invite-codes was reported poorly.
+
+See the changelog for the full list.
+
+To sweeten the deal, we also sneaked in a feature for cargodist that will make it take travel time more into account when routing passengers, mail and other express cargoes.
+
+As the first issue is critical, and if you are using 12.0-beta1, we urge you to upgrade to 12.0-beta2 as soon as possible.
+
+Please keep up the testing, and report any issues as normal!
+
+* [Download](https://www.openttd.org/downloads/openttd-releases/testing.html)
+* [Changelog](https://cdn.openttd.org/openttd-releases/12.0-beta2/changelog.txt)
+* [Bug tracker](https://github.com/OpenTTD/OpenTTD/issues)