Update installation instructions

README.md

@@ -34,15 +34,15 @@ The preferred method of installing this library is with
 [Composer](https://getcomposer.org/) by running the following from your project
 root:
 
-    $ composer require "alcaeus/mongo-php-adapter=dev-master"
+    $ composer require "alcaeus/mongo-php-adapter=^1.0.0@beta"
 
-If your project includes a library that requires `ext-mongo` you need to also
+If your project requires a library that requires `ext-mongo` you need to also
 specify a `provide` option in your composer.json:
     "provide": {
         "ext-mongo": "1.6.12"
     }
 
-Due to a limitation in composer you need to specify this in the root package.
+Due to a limitation in composer you need to specify this in the **root package**.
 
 # Known issues