Update .travis.yml

Author: divineniiquaye

.travis.yml

@@ -7,21 +7,20 @@ cache:
 
 matrix:
     include:
-        - php: 7.2
         - php: 7.3
         - php: 7.4
+        - php: 8.0
     fast_finish: true
 
 before_install:
     - composer self-update --preview
 
 install:
-    - composer update --no-interaction
+    - composer install --no-progress --optimize-autoloader
 
 script:
     - ./vendor/bin/phpcs
     - ./vendor/bin/phpstan analyse
-    - ./vendor/bin/psalm
     - ./vendor/bin/phpunit --coverage-clover=coverage.xml
 
 after_success: