Remove no longer needed dependency

JeroenDeDauw · JeroenDeDauw · commit 39378d00c493 · 2015-08-07T14:25:55.000+02:00
diff --git a/composer.json b/composer.json
@@ -24,7 +24,6 @@
 	},
 	"require": {
 		"php": ">=5.3.0",
-		"diff/diff": "~1.0|~2.0",
 		"data-values/data-values": "~0.1|~1.0"
 	},
 	"require-dev": {
