Update the plugins managment. Add the function 'omz-plugin' (inspired from bash-it)

plugins/available/iwhois/iwhois.plugin.zsh

@@ -0,0 +1,8 @@
+# provide a whois command with a more accurate and up to date list of whois
+# servers using CNAMES via whois.geek.nz
+
+function iwhois() {
+    resolver="whois.geek.nz"
+    tld=`echo ${@: -1} | awk -F "." '{print $NF}'`
+    whois -h ${tld}.${resolver} "$@" ;
+}