update readme, document Data::Validate::IP

README.md

@@ -38,19 +38,20 @@ The code was originally written by Paul Burry and is now hosted and maintained
 through sourceforge.net. Please check out http://ddclient.sf.net
 
 -------------------------------------------------------------------------------
-REQUIREMENTS:
+## REQUIREMENTS:
 
 - one or more accounts from one of the dynamic DNS services
 
 - Perl 5.014 or later
-  (you need the IO::Socket::SSL perl library for ssl-support,
-  JSON::PP perl library for JSON support and
-  IO::Socket:INET6 perl library for ipv6-support)
+  - `Data::Validate::IP` perl library
+  - `IO::Socket::SSL` perl library for ssl-support
+  - `JSON::PP` perl library for JSON support
+  - `IO::Socket:INET6` perl library for ipv6-support
 
 - Linux or probably any common Unix system
 
 -------------------------------------------------------------------------------
-INSTALLATION:
+## INSTALLATION:
 
     cp ddclient /usr/sbin/
     mkdir /etc/ddclient
@@ -89,7 +90,7 @@ INSTALLATION:
     ## as described below.
 
 -------------------------------------------------------------------------------
-TROUBLESHOOTING:
+## TROUBLESHOOTING:
 
   1. enable debugging and verbose messages.
 	 ``$ ddclient -daemon=0 -debug -verbose -noquiet``
@@ -134,7 +135,7 @@ TROUBLESHOOTING:
      while some others accept anything.
 
 -------------------------------------------------------------------------------
-USING DDCLIENT WITH ppp
+## USING DDCLIENT WITH ppp
 
 If you are using a ppp connection, you can easily update your DynDNS
 entry with each connection, with:
@@ -146,7 +147,7 @@ Alternatively, you may just configure ddclient to operate as a daemon
 and monitor your ppp interface.
 
 -------------------------------------------------------------------------------
-USING DDCLIENT WITH cron
+## USING DDCLIENT WITH cron
 
 If you have not configured ddclient to use daemon-mode, you'll need to
 configure cron to force an update once a month so that the dns entry will
@@ -157,7 +158,7 @@ not become stale.
     vi /etc/cron.d/ddclient
 
 -------------------------------------------------------------------------------
-USING DDCLIENT WITH dhcpcd-1.3.17
+## USING DDCLIENT WITH dhcpcd-1.3.17
 
 If you are using dhcpcd-1.3.17 or thereabouts, you can easily update
 your DynDNS entry automatically every time your lease is obtained
@@ -181,7 +182,7 @@ Alternatively, you may just configure ddclient to operate as a daemon
 and monitor your ethernet interface.
 
 -------------------------------------------------------------------------------
-USING DDCLIENT WITH dhclient
+## USING DDCLIENT WITH dhclient
 
 If you are using the ISC DHCP client (dhclient), you can update
 your DynDNS entry automatically every time your lease is obtained