acme-client.gemspec in acme-client-2.0.18 vs acme-client.gemspec in acme-client-2.0.19

- old
+ new

@@ -20,8 +20,9 @@
   spec.add_development_dependency 'rspec', '~> 3.9'
   spec.add_development_dependency 'vcr', '~> 2.9'
   spec.add_development_dependency 'webmock', '~> 3.8'
   spec.add_development_dependency 'webrick', '~> 1.7'
 
+  spec.add_runtime_dependency 'base64', '~> 0.2.0'
   spec.add_runtime_dependency 'faraday', '>= 1.0', '< 3.0.0'
   spec.add_runtime_dependency 'faraday-retry', '>= 1.0', '< 3.0.0'
 end