Allow Symfony YAML 5.0

Author: lookyman

.travis.yml

@@ -11,12 +11,16 @@ matrix:
       env: YAML=3.0
     - php: '7.2'
       env: YAML=4.0
+    - php: '7.2'
+      env: YAML=5.0
     - php: '7.3'
       env: YAML=3.0
     - php: '7.3'
       env: YAML=4.0
+    - php: '7.3'
+      env: YAML=5.0
     - php: nightly
-      env: YAML=4.0
+      env: YAML=5.0
     # windows tests
     # https://travis-ci.community/t/where-to-contribute-php-support-for-windows/304
     - os: windows

composer.json

@@ -20,7 +20,7 @@
 	"require": {
 		"php": ">=7.1.0",
 		"ext-json": "*",
-		"symfony/yaml": "^3.0 | ^4.0",
+		"symfony/yaml": "^3.0 | ^4.0 | ^5.0",
 		"justinrainbow/json-schema": "^5.0"
 	},
 	"require-dev": {