Composer updates (#165)

* updated composer dependencies
* updated README about composer install

README.md

@@ -34,16 +34,16 @@ git clone https://github.com/kevinpapst/kimai2.git
 cd kimai2/
 ```
 
+The next steps depend in which environment you want to use Kimai, you can choose between development or production mode.
+
+### Installation (development)
+
 Lets prepare the environment by installing all dependencies:
 
 ```bash
 composer install
 ```
 
-The next steps depend in which environment you want to use Kimai, you can choose between development or production mode.
-
-### Installation (development)
-
 The default installation uses a SQLite database, so there is no need to create a database for your first tests.
 Our default settings will work out-of-the-box, but you might want to adjust the `.env` values to your needs.
 You can configure your database through your environment (e.g. Webserver, Cloud-Provider) or in your `.env` file:
@@ -106,6 +106,12 @@ npm run prod
 
 ### Installation (production)
 
+Lets prepare the environment by installing all dependencies:
+
+```bash
+composer install --no-dev
+```
+
 Make sure the [directories are read and writable by your webserver](https://symfony.com/doc/current/setup/file_permissions.html):
 ```bash
 chown -R www-data var/