Updated readme

Author: adegruchy

README.md

@@ -3,7 +3,7 @@
 To update this forked extension:
 
 - Modify the "patterns" regex in this file: syntaxes\lit-html.json
-- Build the extension following these instructions: https://code.visualstudio.com/api/working-with-extensions/publishing-extension
+- Package the extension into a VSIX file following these instructions: https://code.visualstudio.com/api/working-with-extensions/publishing-extension#packaging-extensions
 - Create a new release and upload the VSIX file to the assets for the release
 
 [![](https://vsmarketplacebadge.apphb.com/version/bierner.lit-html.svg)](https://marketplace.visualstudio.com/items?itemName=bierner.lit-html) [![Build Status](https://travis-ci.org/mjbvz/vscode-lit-html.svg?branch=master)](https://travis-ci.org/mjbvz/vscode-lit-html)