v3.0.17: remove dev dep

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@root/greenlock",
-	"version": "3.0.16",
+	"version": "3.0.17",
 	"description": "The easiest Let's Encrypt client for Node.js and Browsers",
 	"homepage": "https://rootprojects.org/greenlock/",
 	"main": "greenlock.js",
@@ -40,7 +40,6 @@
 		"@root/keypairs": "^0.9.0",
 		"@root/mkdirp": "^1.0.0",
 		"@root/request": "^1.3.10",
-		"acme-dns-01-digitalocean": "^3.0.1",
 		"acme-http-01-standalone": "^3.0.5",
 		"cert-info": "^1.5.1",
 		"greenlock-manager-fs": "^3.0.1",