fix import headers instead of @headers

lib/tallty_import_export/import.rb

@@ -52,9 +52,9 @@ module TalltyImportExport
     def process_options options
       options = options.with_indifferent_access
       self.headers = options.delete(:headers) || []
-      @primary_keys = options.delete(:primary_keys) || headers.map { |header| header[:primary_key] ? header[:key].to_sym : nil }.compact
+      @primary_keys = options.delete(:primary_keys) || @headers.map { |header| header[:primary_key] ? header[:key].to_sym : nil }.compact
 
-      @excel_hash = headers.reduce({}) do |h, header|
+      @excel_hash = @headers.reduce({}) do |h, header|
         h[header[:key].to_sym] = header[:name]
         h
       end
@@ -75,7 +75,7 @@ module TalltyImportExport
 
     def convert_data line_info
       line_info.with_indifferent_access.reduce({}) do |h, (k, v)|
-        header = headers.find do |_header|
+        header = @headers.find do |_header|
           _header[:key].to_sym == k.to_sym
         end
         # header[:convert] = handle_xxx

lib/tallty_import_export/version.rb

 module TalltyImportExport
-  VERSION = "1.0.5"
+  VERSION = "1.0.6"
 end