Require TLSv2.1 and ruby ~> 2.0 and bump rest-client to a version that supports ssl_version

Author: jingta

CHANGELOG

@@ -1,3 +1,8 @@
+=== 3.0.0 2018-02-09
+
+* Require use of ruby ~> 2.0 and TLSv1.2
+
+
 === 2.7.3 2017-05-25
 
 * Fix bug with introduced around certain JSON objects with IDs (thanks vladvinnikov!)

VERSION

@@ -1 +1 @@
-2.7.3
+3.0.0

easypost.gemspec

@@ -17,8 +17,9 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']
+  spec.required_ruby_version = '~> 2.0'
 
-  spec.add_dependency 'rest-client', '>= 1.4'
+  spec.add_dependency 'rest-client', '>= 1.7'
   spec.add_dependency 'multi_json', '>= 1.3.0'
   spec.add_development_dependency 'bundler', '~> 1.7'
   spec.add_development_dependency 'rake', '~> 10.0'

lib/easypost.rb

@@ -75,7 +75,7 @@ def self.http_config
       timeout: 60,
       open_timeout: 30,
       verify_ssl: false,
-      ssl_version: "TLSv1",
+      ssl_version: :TLSv1_2,
     }
   end