Fix tracy package name

Author: Jan Drábek

composer.json

@@ -15,7 +15,7 @@
 	],
 	"require": {
 		"php": ">= 5.3.2",
-		"nette/tracy": "~2.2"
+		"tracy/tracy": "~2.2"
 	},
 	"autoload": {
 		"psr-4": { "JanDrabek\\Tracy\\": "src/" }