Add sponsor button (#141)

* Update badge link

* ci: update deps

* docs: update readme with InputData and provide example

* chore: add sponsor button

Author: Greg Bowler

.github/FUNDING.yml

@@ -0,0 +1,2 @@
+# These are supported funding model platforms
+github: [phpgt]

composer.json

@@ -21,5 +21,12 @@
 		"psr-4": {
 			"Gt\\Input\\Test\\": "./test/phpunit"
 		}
-	}
-}
+	},
+
+	"funding": [
+		{
+			"type": "github",
+			"url": "https://github.com/sponsors/PhpGt"
+		}
+	]
+}