Prerelease invitation

Author: michaelblyons

messages.json

@@ -1,3 +1,3 @@
 {
-	"2.x": "messages/2.x.txt"
-}
+	"3.1.1": "messages/prerelease-invitation.md"
+}

messages/2.x.txt

@@ -0,0 +1,20 @@
+# Prelease invitation
+
+Hello PowerShell user. There are improvements underway to bring the
+syntax highlighting for PS more in line with the other Sublime Text
+languages. This means your color scheme should start highlighting
+similar concepts the same colors as you are used to in those other
+languages.
+
+It is not perfect. And, as such, I'm inviting adventurous ST users to
+try it out ahead of time. If that sounds like you, open your Package
+Control Settings (usually `Cmd/Ctrl`+`Shift`+`P`, "Preferences: Package
+Control Settings") and add `"PowerShell"` to the array for
+`install_prereleases` in the right-hand pane.
+
+If you find bugs, especially egregious ones that break code
+highlighting further down in the file, please mention them at
+https://github.com/SublimeText/PowerShell/issues and include "v4" in
+the title.
+
+Thank you. Be well.