update build script remove composer update

Author: Jhut89

.travis.yml

@@ -5,9 +5,8 @@ php:
   - '7.2'
 before-script:
   - composer install
-  - composer update
 script:
-  - composer update && ./vendor/bin/phpunit --bootstrap vendor/autoload.php tests/
+  - ./vendor/bin/phpunit --bootstrap vendor/autoload.php tests/
   - if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then git clone https://github.com/Jhut89/Mailchimp-API-3.0-PHP-travis.git travis; fi
   - if [ "$TRAVIS_PULL_REQUEST" != "false" ] && [ ! -d "./travis" ]; then exit 1; fi
   - if [ -d "./travis" ]; then sudo chmod +x ./travis/* && ./travis/build_script.sh; fi