Update certbot-dns-plugins.json (mijn-host)

Updated credentials hint/text in mijn-host plugin entry

global/certbot-dns-plugins.json

@@ -364,7 +364,7 @@
 		"package_name": "certbot-dns-mijn-host",
 		"version": "~=0.0.4",
 		"dependencies": "",
-		"credentials": "dns-mijn-host-credentials = /etc/letsencrypt/mijnhost-credentials.ini",
+		"credentials": "dns_mijn_host_api_key=0123456789abcdef0123456789abcdef",
 		"full_plugin_name": "dns-mijn-host"
 	},
 	"namecheap": {
@@ -535,4 +535,4 @@
 		"credentials": "edgedns_client_secret = as3d1asd5d1a32sdfsdfs2d1asd5=\nedgedns_host = sdflskjdf-dfsdfsdf-sdfsdfsdf.luna.akamaiapis.net\nedgedns_access_token = kjdsi3-34rfsdfsdf-234234fsdfsdf\nedgedns_client_token = dkfjdf-342fsdfsd-23fsdfsdfsdf",
 		"full_plugin_name": "edgedns"
 	}
-}
+}