fix: add resolv 0.2.1

closes #1381
closes #1377

Gemfile

@@ -29,6 +29,7 @@ gem 'moonrope'
 gem 'jwt'
 gem 'acme-client'
 gem 'highline', :require => false
+gem 'resolv', '~> 0.2.1'
 
 group :development, :assets do
   gem 'sass-rails', '~> 5.0'

Gemfile.lock

@@ -186,6 +186,7 @@ GEM
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
+    resolv (0.2.1)
     rspec (3.8.0)
       rspec-core (~> 3.8.0)
       rspec-expectations (~> 3.8.0)
@@ -281,6 +282,7 @@ DEPENDENCIES
   nio4r
   puma (~> 4)
   rails (= 5.2.6)
+  resolv (~> 0.2.1)
   rspec
   rspec-rails
   sass-rails (~> 5.0)