docs: remove roadmap/milestone sections for CONTRIBUTING and README

Author: Sam Harrison

CONTRIBUTING.md

@@ -9,8 +9,6 @@ Hello! Thank you for choosing to help contribute to one of the SendGrid open sou
 - [Creating a Pull Request](#creating-a-pull-request)
 - [Code Reviews](#code-reviews)
 
-We use [Milestones](https://github.com/sendgrid/php-http-client/milestones) to help define current roadmaps, please feel free to grab an issue from the current milestone. Please indicate that you have begun work on it to avoid collisions. Once a PR is made, community review, comments, suggestions, and additional PRs are welcomed and encouraged.
-
 <a name="feature-request"></a>
 ## Feature Request
 

README.md

@@ -20,7 +20,6 @@ All updates to this library are documented in our [CHANGELOG](CHANGELOG.md).
 - [Installation](#installation)
 - [Quick Start](#quick-start)
 - [Usage](#usage)
-- [Roadmap](#roadmap)
 - [How to Contribute](#contribute)
 - [Thanks](#thanks)
 - [About](#about)
@@ -164,11 +163,6 @@ You can do the following to create a .env file:
 
 Then, just add your API Key into your .env file.
 
-<a name="roadmap"></a>
-# Roadmap
-
-If you are interested in the future direction of this project, please take a look at our [milestones](https://github.com/sendgrid/php-http-client/milestones). We would love to hear your feedback.
-
 <a name="contribute"></a>
 # How to Contribute