Update README.md

Author: BhumikaSaini

README.md

@@ -22,8 +22,8 @@ Building the virtual machine is this easy:
     host $ cd rails-dev-box
     host $ vagrant up
 
-(If prompted for login credentials in the <b>VirtualBox VM</b>, use:<br/>
-<b>Username:</b> vagrant <b>Password:</b> vagrant)
+(If prompted for login credentials in the **VirtualBox VM**, use:  
+**Username:** vagrant **Password:** vagrant)
 
 That's it.