update travis ci config

.travis.yml

@@ -11,12 +11,8 @@ addons:
   code_climate:
     repo_token: 486a09d58d663450146c53c81c6c64938bcf3bb0b7c8ddebdc125fe97c18213a
 
-before_install:
-  - sudo apt-get install -y p7zip-full
-
 before_script:
-  - composer validate --no-check-lock
-  - composer install
+  composer install
 
 script:
-  - vendor/bin/phpunit -v -c bootstrap.xml
+  vendor/bin/phpunit -v -c bootstrap.xml