Version 0.14.0 release and blog (#2004)

* new release, and blog

* Edit copy

docs/blog/posts/release0-14.0.md

@@ -0,0 +1,77 @@
+---
+draft: false
+date: 2022-03-09
+categories:
+  - Release
+title: "Textual 0.14.0 shakes up posting messages"
+authors:
+  - willmcgugan
+---
+
+# Textual 0.14.0 shakes up posting messages
+
+Textual version 0.14.0 has landed just a week after 0.13.0.
+
+!!! note
+
+    We like fast releases for Textual. Fast releases means quicker feedback, which means better code.
+
+What's new?
+
+<!-- more -->
+
+We did a little shake-up of posting [messages](../../guide/events.md) which will simplify building widgets. But this does mean a few breaking changes.
+
+There are two methods in Textual to post messages: `post_message` and `post_message_no_wait`. The former was asynchronous (you needed to `await` it), and the latter was a regular method call. These two methods have been replaced with a single `post_message` method.
+
+To upgrade your project to Textual 0.14.0, you will need to do the following:
+
+- Remove `await` keywords from any calls to `post_message`.
+- Replace any calls to `post_message_no_wait` with `post_message`.
+
+
+Additionally, we've simplified constructing messages classes. Previously all messages required a `sender` argument, which had to be manually set. This was a clear violation of our "no boilerplate" policy, and has been dropped. There is still a `sender` property on messages / events, but it is set automatically.
+
+So prior to 0.14.0 you might have posted messages like the following:
+
+```python
+async self.post_message(self.Changed(self, item=self.item))
+```
+
+You can now replace it with this simpler function call:
+
+```python
+self.post_message(self.Change(item=self.item))
+```
+
+This also means that you will need to drop the sender from any custom messages you have created.
+
+If this was code pre-0.14.0:
+
+```python
+class MyWidget(Widget):
+
+    class Changed(Message):
+        """My widget change event."""
+        def __init__(self, sender:MessageTarget, item_index:int) -> None:
+            self.item_index = item_index
+            super().__init__(sender)
+
+```
+
+You would need to make the following change (dropping `sender`).
+
+```python
+class MyWidget(Widget):
+
+    class Changed(Message):
+        """My widget change event."""
+        def __init__(self, item_index:int) -> None:
+            self.item_index = item_index
+            super().__init__()
+
+```
+
+If you have any problems upgrading, join our [Discord server](https://discord.gg/Enf6Z3qhVr), we would be happy to help.
+
+See the [release notes](https://github.com/Textualize/textual/releases/tag/v0.14.0) for the full details on this update.