Added base64 as an explicit dependency

Author: kpumuk

lib/rb/thrift.gemspec

@@ -26,15 +26,16 @@ Gem::Specification.new do |s|
 
   s.require_paths = %w[lib ext]
 
+  s.add_dependency 'base64'
+
   s.add_development_dependency 'bundler',            '>= 1.11'
   s.add_development_dependency 'pry',                '~> 0.11.3'
   s.add_development_dependency 'pry-byebug',         '~> 3.6'
   s.add_development_dependency 'pry-stack_explorer', '~> 0.4.9.2'
   s.add_development_dependency 'rack',               '=  2.2.6.4'
   s.add_development_dependency 'rack-test',          '~> 0.8.3'
-  s.add_development_dependency 'rake',               '~> 12.3'
+  s.add_development_dependency 'rake',               '~> 13.3'
   s.add_development_dependency 'rspec',              '~> 3.7'
   s.add_development_dependency 'srv',                '~> 1.0'
   s.add_development_dependency 'thin',               '~> 1.7'
 end
-