Update dependencies

.gitlab-ci.yml

@@ -1,14 +1,3 @@
-test:7:
-    stage: test
-    before_script:
-      - sh build/docker_install.sh > /dev/null
-      - apk add --no-cache php7-phpdbg
-      - curl -sS https://getcomposer.org/installer | php
-      - php composer.phar install --ignore-platform-reqs
-    image: php:7.0-alpine
-    script:
-      - phpdbg -qrr -- ./vendor/bin/phpunit --coverage-text --colors=never
-
 test:7.1:
     stage: test
     before_script:

composer.json

@@ -40,7 +40,7 @@
 		"robmorgan/phinx": "^0.9.1",
 		"consolidation/robo": "~1.0",
 		"henrikbjorn/lurker": "^1.1.0",
-		"symfony/var-dumper": "^3.2",
+		"symfony/var-dumper": "^4.0.1",
 		"squizlabs/php_codesniffer": "^3.0.0@beta",
 		"phpstan/phpstan": "^0.9.1",
 		"spatie/phpunit-snapshot-assertions": "^1.2.0"