updated docs to remove no longer used flag

roles/extra_packages/README.md

@@ -4,9 +4,8 @@ Before calling, you may want to  define the following lists:
 
 extra_packages  #list of yum packages. Or see code on how to it loads an  alternative file  if not defined
 exclude 	#list of packages to exclude
-useEpel 	# if defined, it will enable epel repo
 
 
 Usage:
   roles:
-  - { role: extra_packages, useEpel: True, tags: [ other, extra_packages ] }
+  - { role: extra_packages, tags: [ other, extra_packages ] }