Fix outdated rspec config and syntax

certifi.gemspec

@@ -31,7 +31,7 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_development_dependency "bundler", "~> 1.6"
+  spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rspec-core"
   spec.add_development_dependency "rspec-expectations"

spec/certifi_spec.rb

@@ -1,10 +1,11 @@
 require_relative 'spec_helper'
 require_relative '../lib/certifi'
+require "net/http"
 
 describe Certifi do
   describe ".where" do
     it "should return the path to the cacert.pem" do
-      expect(File.exist?(Certifi.where)).to be_true
+      expect(File.exist?(Certifi.where)).to be true
     end
 
     it "should verify the cert" do

spec/spec_helper.rb

@@ -8,5 +8,5 @@
   config.expect_with :rspec do |c|
     c.syntax = :expect
   end
-  config.mock_with :none
+  config.mock_with :nothing
 end