Gemfile: Move dependencies from rbnacl-libsodium.gemspec

Gemfile

-source 'https://rubygems.org'
+source "https://rubygems.org"
 
 gemspec
 
-gem "rbnacl", git: 'https://github.com/cryptosphere/rbnacl.git'
+gem "rbnacl", git: "https://github.com/cryptosphere/rbnacl.git"
 
 group :development, :test do
+  gem "rake", ">= 10"
+  gem "rake-compiler", "~> 1.0"
+  gem "rake-compiler-dock", "~> 0.6"
   gem "rspec", "~> 3"
 end

rbnacl-libsodium.gemspec

@@ -19,11 +19,8 @@ Gem::Specification.new do |spec|
 
   spec.extensions    = ['ext/rbnacl/extconf.rb']
 
-  spec.add_runtime_dependency "rbnacl", ">= 3.0.1"
+  spec.add_runtime_dependency "rbnacl", ">= 5.0.0"
   spec.required_ruby_version = '>= 2.2.6'
 
-  spec.add_development_dependency "bundler", "~> 1.5"
-  spec.add_development_dependency "rake", ">= 10"
-  spec.add_development_dependency 'rake-compiler', '~> 0.9.7'
-  spec.add_development_dependency 'rake-compiler-dock', '~> 0.5.2'
+  spec.add_development_dependency "bundler", "~> 1.16"
 end