Update development.md

Author: SydneyhSmith

docs/development.md

@@ -16,7 +16,7 @@ to before you can proceed.
     Insiders means the extension can be developed ready for new features
     and changes in the next VSCode release.
 
-5. Install [Node.js](https://nodejs.org/en/) 8.x or higher.
+5. Install [Node.js](https://nodejs.org/en/) 10.x or higher.
 
 ## Building the Code
 
@@ -45,18 +45,6 @@ press <kbd>Ctrl</kbd>+<kbd>F5</kbd> or <kbd>Cmd</kbd>+<kbd>F5</kbd> on macOS.
 code --extensionDevelopmentPath="c:\path\to\vscode-powershell" .
 ```
 
-## Building a "Preview" version
-
-To build a preview version of the extension, that is to say,
-a version of the extension named "PowerShell Preview",
-You can simply change the `name` in the package.json to include `-Preview` at the end.
-When you build, this will:
-
-- Add a warning to the top of the README.md to warn users not to have the stable and preview version enabled at the same time
-- Adds "Preview" in a few places in the package.json
-
-This mechanism is mostly used for releases
-
 ## Contributing Snippets
 
 For more information on contributing snippets please read our [snippet requirements](https://github.com/PowerShell/vscode-powershell/blob/master/docs/community_snippets.md#contributing).