fix fuckedtail

src/moonscript/fuckedtail.moon

@@ -3,13 +3,17 @@ class Buffer
     @limit = limit
     @data = {}
 
+  purge: =>
+    if #@data > @limit
+      table.remove @data, 1
+      @purge!
+    else return
+
   add: (line) =>
-    if #@data == @limit
-      table.remove @data, 0
-
     table.insert @data, line
+    @purge!
 
-with Buffer 10
+with Buffer 5
   while true
     n = io.read!
     if n ~= nil