Remove command_lookups reader

lib/liquid/variable_lookup.rb

@@ -3,7 +3,7 @@ module Liquid
     SQUARE_BRACKETED = /\A\[(.*)\]\z/m
     COMMAND_METHODS = ['size'.freeze, 'first'.freeze, 'last'.freeze]
 
-    attr_reader :name, :lookups, :command_flags
+    attr_reader :name, :lookups
 
     def self.parse(markup)
       new(markup)

test/unit/variable_unit_test.rb

@@ -152,11 +152,5 @@ class VariableUnitTest < Minitest::Test
     lookup = VariableLookup.new('a.b.c')
     assert_equal 'a', lookup.name
     assert_equal ['b', 'c'], lookup.lookups
-    assert_equal 0, lookup.command_flags
-
-    lookup = VariableLookup.new('a.first.size')
-    assert_equal 'a', lookup.name
-    assert_equal ['first', 'size'], lookup.lookups
-    assert_equal 0b11, lookup.command_flags
   end
 end