Gemfile in metanorma-vsd-0.3.3 vs Gemfile in metanorma-vsd-0.4.1

@@ -1,2 +1,5 @@
+Encoding.default_external = Encoding::UTF_8
+Encoding.default_internal = Encoding::UTF_8
+
 source "https://rubygems.org"
 git_source(:github) {|repo| "https://github.com/#{repo}" }