Gemfile.rails50 in ndr_import-8.5.0

- old
+ new

@@ -1,5 +1,8 @@
 source 'https://rubygems.org'
 
+# ooxml_decrypt is not published to rubygems.org so we need to specify where it is
+gem 'ooxml_decrypt', git: 'https://github.com/timgentry/ooxml_decrypt'
+
 gemspec path: '..'
 
 gem 'activesupport', '~> 5.0.0'