fix ci

spec/lib/roqua/csv_export_spec.rb

@@ -7,7 +7,7 @@ OUTPUT_PATH = RSPEC_ROOT_PATH.join('..', 'tmp', 'data_export') # constant, since
 describe Roqua::CsvExport do
   let(:version_dir) { OUTPUT_PATH.join("example_#{export_version_key}") }
   let(:version_questionnaire_file) { version_dir.join("#{version_questionnaire_key}_#{Time.now.strftime("%Y-%m-%d")}.csv") }
-  let(:csv) { CSV.read(version_questionnaire_file, col_sep: ';', headers: true, encoding: 'UTF-8:UTF-8') }
+  let(:csv) { CSV.read(version_questionnaire_file, col_sep: ';', headers: true, encoding: 'UTF-8') }
   let(:version_questionnaire_key) { 'all_quests' }
   let(:export_version_key) { 'v201809' }