Update dependencies

Author: Jesus

Gemfile

@@ -4,6 +4,23 @@ source 'https://rubygems.org'
 gemspec
 
 group :development do
+  gem 'bundler', '>= 1.7'
+  gem 'rake'
+
+  # Test
+  gem 'rspec'
+  gem 'vcr'
+  gem 'webmock'
+
+  # Gem dependencies
+  if RUBY_VERSION >= '2.6'
+    gem 'faraday', '~> 2.0'
+    gem 'faraday-net_http_persistent'
+  else
+    gem 'faraday', '~> 1.0'
+  end
+
+
   # Documentation
   gem 'redcarpet'
   gem 'yard-tests-rspec', git: 'https://github.com/Jesus/yard-spec-plugin.git'

dropbox_api.gemspec

@@ -18,14 +18,7 @@ Gem::Specification.new do |spec|
 
   spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'bundler', '>= 1.7'
-  spec.add_development_dependency 'rake'
-  spec.add_development_dependency 'rspec'
-  spec.add_development_dependency 'vcr'
-  spec.add_development_dependency 'webmock'
-
-  spec.add_development_dependency 'faraday', '~> 2.2'
-  spec.add_development_dependency 'faraday-net_http_persistent'
+  spec.required_ruby_version = '>= 2.3'
 
   spec.add_dependency 'faraday', '< 3.0'
   spec.add_dependency 'oauth2', '~> 1.1'