[BUGFIX] Import the database after the composer install

This is required to fix the build as the database structure that is going
to be imported is only available after the composer install.

.travis.yml

@@ -22,15 +22,17 @@ cache:
 
 before_install:
   - phpenv config-rm xdebug.ini
+
+install:
+  - composer install
+
+before_script:
   - >
     echo;
     echo "Importing the database schema";
     mysql -e "CREATE DATABASE ${PHPLIST_DATABASE_NAME};";
     mysql ${PHPLIST_DATABASE_NAME} < vendor/phplist/phplist4-core/Database/Schema.sql;
 
-install:
-  - composer install
-
 script:
   - >
     echo;