Fix letsencrypt chellange (#156)

* Fix generation

* Update config.json

letsencrypt/config.json

@@ -1,6 +1,6 @@
 {
   "name": "Let's Encrypt",
-  "version": "1.0",
+  "version": "1.1",
   "slug": "letsencrypt",
   "description": "Manage Let's Encrypt certificate",
   "url": "https://home-assistant.io/addons/lets_encrypt/",

letsencrypt/run.sh

@@ -15,9 +15,9 @@ mkdir -p "$CERT_DIR"
 
 # Select challenge
 if [ "$CHALLENGE" == "http" ]; then
-    CERTBOT_CHALLENGE="http-01"
+    CERTBOT_CHALLENGE="http"
 else
-    CERTBOT_CHALLENGE="tls-sni-01"
+    CERTBOT_CHALLENGE="tls-sni"
 fi
 
 # Generate new certs