Update zplug snippet

Author: Shougo

neosnippets/zsh.snip

@@ -1,6 +1,6 @@
 include sh.snip
 
 snippet     zplug
-options     head
+abbr zplug "plugin"
         zplug "`getreg('+')=='' ? '<\`0\`>' : getreg('+')`"${0}