Merge pull request #93 from quentint/master

Allow more recent `symfony/options-resolver`

Author: josiasmontag

composer.json

@@ -15,7 +15,7 @@
     "php-http/httplug": "^1.0 || ^2.0",
     "php-http/message-factory": "^1.0",
     "php-http/discovery": "^1.0",
-    "symfony/options-resolver": "^4.2 || ^5.0",
+    "symfony/options-resolver": "^4.2 || ^5.0 || ^6.0",
     "netresearch/jsonmapper": "^4.0",
     "php-http/multipart-stream-builder": "^1.0",
     "php-http/client-common": "^2.0",