Issue #34: Fixed package installation command

Signed-off-by: alexmerlin <alex.merlin.1985@gmail.com>

Author: alexmerlin

README.md

@@ -25,7 +25,7 @@ Documentation is available at: https://docs.dotkernel.org/dot-maker/.
 Run the following command in your terminal:
 
 ```shell
-composer require-dev dotkernel/dot-maker
+composer require --dev dotkernel/dot-maker
 ```
 
 ## Setup

docs/book/v1/installation.md

@@ -3,5 +3,5 @@
 Install `dotkernel/dot-maker` by executing the following Composer command:
 
 ```shell
-composer require-dev dotkernel/dot-maker
+composer require --dev dotkernel/dot-maker
 ```