update package name

package.json

@@ -1,5 +1,5 @@
 {
-	"name": "greenlock-challenge-test",
+	"name": "acme-challenge-test",
 	"version": "3.0.3",
 	"description": "The base set of tests for all ACME challenge strategies. Any `acme-http-01-`, `acme-dns-01-`, `acme-challenge-`, or greenlock plugin should be able to pass these tests.",
 	"main": "index.js",