fix mardown

README.md

@@ -17,27 +17,27 @@ TBD
 # Configuration
 The configuration options are described in `homeserverdns.cfg`. First a protocol has to be defined, e.g.
 
-``
+```
 protocol=gandi
-``
+```
 
 For authentication at the domain provider, an authentication token has to be geven. Some protocols require a user name and an API address, too.
 
-``
+```
 auth_key=g5Hdsfkj5J49li8HH3jfhsJp
 user= 		# not required for gandi
 api_address=	# not required for gandi
-``
+```
 
 Now the domains (and subdomains) we want to update A and AAAA records for have to be defined.
 
-``
+```
 domains=mydomain.com sub.mydomain.com
-``
+```
 
 By default `UPNP` is used for detecting the server's public IPv4 address. So we should check if upnp works and returns the correct IPv4 address.
 
-``
+```
 $ upnpc -s
 upnpc : miniupnpc library test client, version 1.9.                                       
  (c) 2005-2016 Thomas Bernard.                                                            
@@ -56,10 +56,10 @@ MaxBitRateDown : 10000000 bps (10.0 Mbps)   MaxBitRateUp 1000000 bps (1.0 Mbps)
 ExternalIPAddress = 85.98.82.44
 Bytes:   Sent: 402633281        Recv: 816703147
 Packets: Sent:  3408416 Recv:  4216845
-``
+```
 
 If we don't get a value for `ExternalIPAddress`, we should check our router and firewall settings. If `UPNP` does not work for us (e.g. in case the server is behind a Carrier Grade NAT), we can define our own method for looking up our public IPv4 address using the `public_ip4_hook` config option, e.g. 
 
-``
+```
 public_ip4_hook=curl -s -4 https://ipecho.net/plain
-``
+```