update installation instructions

Author: troosan

README.md

@@ -67,10 +67,18 @@ PHPWord requires the following:
 ## Installation
 
 PHPWord is installed via [Composer](https://getcomposer.org/).
-You just need to [add dependency](https://getcomposer.org/doc/04-schema.md#package-links>) on PHPWord into your package.
+To [add a dependency](https://getcomposer.org/doc/04-schema.md#package-links>) to PHPWord in your project, either
 
-Example:
+Run the following to use the latest stable version
+```sh
+    composer require phpoffice/phpword
+```
+or if you want the latest master version
+```sh
+    composer require phpoffice/phpword:dev-master
+```
 
+You can of course also manually edit your composer.json file
 ```json
 {
     "require": {