Added Nano install command for vagrant file

Author: sujankumar45

vagrant/centos-7/virtualbox/amd64/server/Vagrantfile

@@ -88,7 +88,7 @@ Vagrant.configure("2") do |config|
     systemctl stop postfix.service
     systemctl disable postfix.service
     yum update -y
-    yum install -y wget vim net-tools initscripts gcc make tar bind-utils nc git unzip sysstat tree
+    yum install -y wget vim nano net-tools initscripts gcc make tar bind-utils nc git unzip sysstat tree
   SHELL
 
   # Define multiple virtual machines.