fix: 去掉低版本不支持内容

lib/tallty_import_export/export.rb

@@ -141,7 +141,7 @@ module TalltyImportExport
     end
 
     def process_options options = {}
-      options = export_options.merge(options.compact_blank!).with_indifferent_access
+      options = export_options.merge(options).with_indifferent_access
 
       @row_height ||= options.delete(:row_height) || 25
       @width ||= (options.delete(:width) || 20).to_f

lib/tallty_import_export/import.rb

@@ -75,7 +75,7 @@ module TalltyImportExport
     end
 
     def process_options options
-      options = import_options.merge(options.compact_blank!).with_indifferent_access
+      options = import_options.merge(options).with_indifferent_access
       @headers = options.delete(:headers) || import_headers
       @primary_keys = options.delete(:primary_keys) || @headers.map { |header| header[:primary_key] ? header[:key].to_sym : nil }.compact
       @skip_keys = options.delete(:skip_keys) || @headers.map { |header| header[:skip] ? header[:key].to_sym : nil }.compact