Gemfile in nubank_sdk-0.6.0 vs Gemfile in nubank_sdk-0.6.1

@@ -1,5 +1,7 @@
-source "https://rubygems.org"
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
 
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
 # Specify your gem's dependencies in nubank_sdk.gemspec
 gemspec