Do not lock Nette Utils 2.4

Version `3.0+` working with Nette\Utils `2.5` - there is no reason to disallowed it.

Tested in fork on our project.

Author: kravcik

composer.json

@@ -18,9 +18,9 @@
 	],
 	"require": {
 		"php": "~5.6.0 || ~7.0",
-		"nette/application": "~2.4.0 || ~3.0.0",
-		"nette/forms": "~2.4.0 || ~3.0.0",
-		"nette/utils": "~2.4.0 || ~3.0.0"
+		"nette/application": "~2.4 || ~3.0.0",
+		"nette/forms": "~2.4 || ~3.0.0",
+		"nette/utils": "~2.4 || ~3.0.0"
 	},
 	"require-dev": {
 		"nette/di": "~2.4.6 || ~3.0.0",