composer 2.0

.travis.yml

@@ -18,13 +18,14 @@ services:
 
 install:
 #  - wget - https://dl.google.com/dl/linux/direct/google-chrome-stable_current_amd64.deb
-  - sudo apt-get clean
-  - sudo apt-get update
-  - sudo apt-get install dpkg -f
+  - apt-get clean
+  - apt-get update
+  - apt-get install dpkg -f
 #  - sudo apt-get -f install
 #  - sudo apt upgrade dpkg
-  - sudo dpkg -i /tmp/google-chrome-stable_current_amd64.deb
+  - dpkg -i /tmp/google-chrome-stable_current_amd64.deb
   - mysql -e 'create database if not exists laravel;'
+  - composer self-update
   - travis_retry composer create-project --prefer-dist laravel/laravel laravel-tests
   - cp -f ./tests/resources/stubs/artisan ./laravel-tests/
   - cp -f ./tests/resources/stubs/ComposerConfigCommand.php ./laravel-tests/app/