describe versions and installation

Author: Conduitry

README.md

@@ -11,9 +11,9 @@ An ESLint plugin for Svelte v3 components.
 
 ## Installation
 
-This is not published to npm. Install from Git tags. See [the documentation on `npm install`](https://docs.npmjs.com/cli/install) for how to do this.
+For now, this is not published to npm. Install from Git tags. See [the documentation on `npm install`](https://docs.npmjs.com/cli/install) for how to do this.
 
-This plugin needs to be able to `require('svelte/compiler')`. It requires Svelte 3.0.0-alpha2 or later.
+Untagged releases may depend on unreleased Svelte 3 features. Tagged releases should always work with the specified Svelte version. The latest tagged version requires at least Svelte 3.0.0-alpha2.
 
 ## Usage
 
@@ -24,6 +24,8 @@ plugins:
   - svelte3
 ```
 
+This plugin needs to be able to `require('svelte/compiler')`. If ESLint, this plugin, and Svelte are all installed locally in your project, this should not be a problem.
+
 ## Configuration
 
 By default, all `.svelte` files will be linted. You can set the `svelte3/extensions` setting in your `.eslintrc` to an array of file extensions to override this.