Merge pull request #13 from tristanlins/patch-1

Clearify documentation to circumvent error `git log failed when compiling.`

README.md

@@ -17,8 +17,13 @@ curl -sS https://getcomposer.org/installer | php
 
 2. Install the application.
 ```
-./composer create-project cyberspectrum/contao-toolbox
+php composer create-project --prefer-source cyberspectrum/contao-toolbox
 ```
+**Hint:** At the end of the installation composer will ask you to remove the vcs history:
+
+> Do you want to remove the existing VCS (.git, .svn..) history? [Y,n]?
+
+You must not confirm this question, type `n` to keep the history, otherwise the compiler will not work!
 
 ### via plain git cloning
 ```