Update .travis.yml

.travis.yml

@@ -22,7 +22,7 @@ install:
   - sudo apt-get update
   - sudo apt-get install dpkg -f
 #  - sudo apt-get -f install
-  - sudo apt upgrade dpkg
+#  - sudo apt upgrade dpkg
   - sudo dpkg -i /tmp/google-chrome-stable_current_amd64.deb
   - mysql -e 'create database if not exists laravel;'
   - travis_retry composer create-project --prefer-dist laravel/laravel laravel-tests