Bump Nokogiri dep to address security concern

Author: bklang

sippy_cup.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 
   s.add_runtime_dependency 'packetfu', [">= 1.1.13"]
-  s.add_runtime_dependency 'nokogiri', ["~> 1.8.1"]
+  s.add_runtime_dependency 'nokogiri', ["~> 1.10.4"]
   s.add_runtime_dependency 'activesupport', [">= 3.0"]
   s.add_runtime_dependency 'psych', ["~> 2.0.1"] unless RUBY_PLATFORM == 'java'