Updated README

Author: dantleech

README.md

@@ -9,8 +9,6 @@ with [VSCode](https://github.com/neoclide/coc.nvim).
 Installation
 ------------
 
-First, install [Phpactor](https://phpactor.readthedocs.io/en/develop/usage/standalone.html).
-
 The package isn't published yet on the "marketplace" so:
 
 1. Install [yarn](https://classic.yarnpkg.com/en/docs/install) and [npm](https://www.npmjs.com/get-npm).
@@ -26,6 +24,7 @@ Phpactor should then be enabled the next time you start VS code.
 Commands
 --------
 
+- `phpactor.update`: Update Phpactor to the latest version
 - `phpactor.status`: Show Phpactor's status
 - `phpactor.reindex`: Reindex the project.
 - `phpactor.services.list`: List Phpactor's currently running services.