Update ruby-http-client dependency

Author: thinkingserious

CONTRIBUTING.md

@@ -91,10 +91,18 @@ source ./sendgrid.env
 
 See the [examples folder](https://github.com/sendgrid/sendgrid-ruby/tree/master/examples) to get started quickly.
 
-To run the examples:
+To run the examples using the local version of this library from the root directory of this repo, please replace:
+
+`require 'sendgrid-ruby'`
+
+with:
+
+`require_relative './lib/sendgrid-ruby.rb'`
+
+Then run using:
 
 ```bash
-ruby examples/example.rb
+ruby example.rb
 ```
 
 <a name="understanding_the_codebase"></a>

README.md

@@ -114,8 +114,8 @@ mail = Mail.new(from, subject, to, content)
 sg = SendGrid::API.new(api_key: ENV['SENDGRID_API_KEY'])
 response = sg.client.mail._('send').beta.post(request_body: mail.to_json)
 puts response.status_code
-puts response.response_body
-puts response.response_headers
+puts response.body
+puts response.headers
 ```
 
 ## General v3 Web API Usage
@@ -125,8 +125,8 @@ require 'sendgrid-ruby'
 sg = SendGrid::API.new(api_key: ENV['SENDGRID_API_KEY'])
 response = sg.client.api_keys.get()
 puts response.status_code
-puts response.response_body
-puts response.response_headers
+puts response.body
+puts response.headers
 ```
 
 # Usage