Add: Release post for 1.9.1

_posts/2019-04-08-openttd-1-9-1.md

@@ -0,0 +1,13 @@
+---
+title: OpenTTD 1.9.1
+author: peter1138
+---
+
+OpenTTD 1.9.1 is now published.
+
+A few little gremlins crept into 1.9.0, so we thought we'd put the build farm to use while it still had some (undefined string) and release 1.9.1.
+There are no bugs left, which is just as well as we don't want to run out of version numbers.
+
+* [Download](https://www.openttd.org/downloads/openttd-releases/latest.html)
+* [Changelog](https://proxy.binaries.openttd.org/openttd-releases/1.9.1/changelog.txt)
+* [Bug tracker](https://github.com/OpenTTD/OpenTTD/issues)