update phpunit version

Author: mmasiukevich

.travis.yml

@@ -25,8 +25,8 @@ install:
 
 script:
   - ./vendor/bin/phpunit --configuration ./phpunit.xml --coverage-clover=coverage.clover
+  - if [ "$TRAVIS_PHP_VERSION" == "7.2" ]; then ./vendor/bin/psalm --config=psalm.xml; fi
 
 after_script:
   - if [ "$TRAVIS_PHP_VERSION" == "7.2" ]; then wget -c -nc --retry-connrefused --tries=0 https://scrutinizer-ci.com/ocular.phar; fi
   - if [ "$TRAVIS_PHP_VERSION" == "7.2" ]; then php ocular.phar code-coverage:upload --format=php-clover coverage.clover; fi
-  - if [ "$TRAVIS_PHP_VERSION" == "7.2" ]; then ./vendor/bin/psalm --config=psalm.xml; fi

composer.json

@@ -47,7 +47,7 @@
     "php-service-bus/storage-sql": "^v3.0",
     "php-service-bus/annotations-reader": "^v3.0",
     "doctrine/dbal": "^v2.6",
-    "phpunit/phpunit": "^7",
+    "phpunit/phpunit": "^8",
     "vimeo/psalm": "^v3"
   },
   "prefer-stable": true,