update version contraints

- add php 7.4 to travis
- restrict symfony/yaml to <4.4 temporarily (dev-master only)
- update php-cs-fixer
- remove php platform config from composer.json

Author: cebe

.travis.yml

@@ -4,19 +4,27 @@ matrix:
   include:
     # linux tests
     - php: '7.1'
-      env: YAML=3.0
+      env: YAML=^3.0
     - php: '7.1'
-      env: YAML=4.0
+      env: YAML=~4.3.0
     - php: '7.2'
-      env: YAML=3.0
+      env: YAML=^3.0
     - php: '7.2'
-      env: YAML=4.0
+      env: YAML=~4.3.0
     - php: '7.3'
-      env: YAML=3.0
+      env: YAML=^3.0
     - php: '7.3'
-      env: YAML=4.0
+      env: YAML=~4.3.0
+#    - php: '7.3'
+#      env: YAML=^5.0
+    - php: '7.4'
+      env: YAML=^3.0
+    - php: '7.4'
+      env: YAML=~4.3.0
+#    - php: '7.4'
+#      env: YAML=^5.0
     - php: nightly
-      env: YAML=4.0
+      env: YAML=~4.3.0
     # windows tests
     # https://travis-ci.community/t/where-to-contribute-php-support-for-windows/304
     - os: windows
@@ -43,7 +51,7 @@ matrix:
 
 install:
   - make install
-  - composer require symfony/yaml:"^${YAML}" --prefer-dist --no-interaction
+  - composer require symfony/yaml:"${YAML}" --prefer-dist --no-interaction
 script:
   - make lint
   - make test

composer.json

@@ -20,12 +20,12 @@
 	"require": {
 		"php": ">=7.1.0",
 		"ext-json": "*",
-		"symfony/yaml": "^3.0 | ^4.0",
+		"symfony/yaml": "^3.0 | ~4.0.0 | ~4.1.0 | ~4.2.0 | ~4.3.0",
 		"justinrainbow/json-schema": "^5.0"
 	},
 	"require-dev": {
 		"cebe/indent": "*",
-		"friendsofphp/php-cs-fixer": "~2.13.1",
+		"friendsofphp/php-cs-fixer": "~2.16.1",
 		"phpunit/phpunit": "^6.5",
 
 		"oai/openapi-specification": "3.0.2",
@@ -38,11 +38,6 @@
 			"cebe\\openapi\\": "src/"
 		}
 	},
-	"config": {
-		"platform": {
-			"php": "7.1.3"
-		}
-	},
 	"extra": {
 		"branch-alias": {
 			"dev-master": "1.0.x-dev"